Néstor Fabián Caballero (31 January 1978 – 27 September 2024), commonly referred to as Tyson, was an Argentine-Paraguayan professional footballer who played as a forward.
Caballero had a 19-year career, playing in Argentina, Paraguay, England, Scotland, South Korea, Cyprus, Chile, Greece and Guatemala, and also playing in continental competitions such as the UEFA Intertoto Cup, the UEFA Cup, the Copa Libertadores and the Copa Sudamericana. In 1998, Caballero was loaned from Cerro Porteño to Arsenal for the 1998–99 FA Premier League season, where he made a total of three appearances in all competitions. In 2000, Caballero signed with Scottish Premier League club Dundee, where he was present until 2005. He played in the 2001 UEFA Intertoto Cup and finished as runners-up in the 2002–03 Scottish Cup, after a 1–0 loss against Rangers in the final on 31 May 2003. Caballero scored 27 goals in 128 appearances in all competitions for Dundee.
Caballero was leading goal scorer of the Torneo Apertura during the 2000 Paraguayan Primera División season with 13 goals whilst playing for Club Sol de América. In 2004, Caballero was awarded as the Player of the Season of Dundee FC for the 2003–04 season.
Caballero began his coaching career with Sportivo Ameliano in 2012, working with the club's U16, U18 and reserve-teams, he later became a Player-coach whilst playing for the club's first-team in 2014.
Whilst playing with Arsenal's reserve-team, Caballero was described as "making very good runs which create space for the other forwards" and that the squad looked "infinitely more dangerous" when he was on the field.
In May 2015, Caballero announced that was running for election as a city councilor in Asunción.
Caballero began his career with Guaraní Antonio Franco in his native Posadas, Misiones. He then joined Estudiantes de La Plata of the city La Plata in the province of Buenos Aires, where he joined the U20 youth team. Caballero was then transferred to Atlético Tembetary of the Paraguayan Primera División. The son of Spanish parents, he lived in Paraguay for most of his teenage life.
On 1 August 1997, Caballero signed with Cerro Porteño in the Paraguayan Primera División, where he joined the likes of Diego Gavilan and Paulo da Silva.
Caballero participated in the 1998 Copa Libertadores as Cerro Porteño were drawn with Uruguay's Peñarol in the quarter-final stage. On 20 May, Caballero played 55 minutes of the first-leg of the quarter-final, before being replaced by Sergio Fernandez, in Cerro Porteño's 2–0 away defeat. In the return leg on 27 May, Caballero would play 69 minutes of the match before being replaced by Oscar Ferreira, as Cerro Porteño would win 3–0 and qualify for the semi-finals with a 3–2 aggregate score line. At the semi-final stage, Cerro Porteño faced Ecuador's Barcelona Sporting Club. After a 1–0 away defeat on 16 July, Cerro Porteño hosted the return leg at the Estadio Defensores del Chaco on 22 July. Caballero scored in the 4th minute of the match to level the scores 1–1 on aggregate; the match concluded in a 2–1 for Cerro Porteño, being 2–2 on aggregate. Barcelona went on to win via penalties, with Barcelona goal keeper José Cevallos saving Caballero's and two other of Cerro Porteño's penalties, eliminating Cerro Porteño from the competition. Caballero had scored 1 goal in 10 Copa Libertadores appearances.
On 29 October 1998, Caballero was loaned to Arsenal from Cerro Porteño for the remainder of the 1998–99 FA Premier League season (with an option for a permanent transfer), where he was issued the number #26. Caballero was also part of the club's reserve-team, playing in the 1998–99 FA Premier Reserve League and scoring eight goals in 16 league appearances as the squad finished in ninth position of the table with 45 points. He played in the reserve-team alongside Nwankwo Kanu, Alberto Méndez, Jason Crowe and Kaba Diawara. His first goal for the reserve-team came in a 4–1 away defeat against Wimbledon on 4 November. Caballero would go on to score in the next three matches in a 3–3 home draw with Fulham (16 November), a 2–1 away victory against AFC Bournemouth (24 November) and a 2–0 home victory against Queens Park Rangers (30 November), totaling to a run of four goals in four consecutive matches. He made his debut for Arsenal's first-team as a substitute in a 5–0 home defeat by Chelsea on 11 November 1998 in the League Cup, entering the field for Dennis Bergkamp in the second half. On 29 November 1998, Caballero debuted in the Premier League in a 1–1 home draw against Middlesbrough, when he was substituted onto the field for Freddie Ljungberg in the 74th minute of the match. Caballero went on to make one more appearance for Arsenal, in a 4–2 FA Cup third-round victory away against Preston North End on 4 January 1999, where he assisted Emmanuel Petit in scoring one of Arsenal's goals. He would score his last goals for the club's reserve-team scoring once in a 5–0 home thrashing against Crystal Palace on 7 April and scoring a double in a 3–1 home victory against Ipswich Town on 21 April. Caballero would take no part in Arsenal's 1998–99 UEFA Champions League campaign when, after making three appearances in all competitions, he was released on 9 June 1999 and returned to Paraguay to join former club Atlético Tembetary.
In Round 1 of the Torneo Apertura 2000 Paraguayan Primera División season. Caballado scored Sol de América's only goal in the 25th minute in their 4–1 home loss against Colegiales. In the following round, Caballero scored an 83rd-minute equalizer in a 2–2 away draw against Guaraní. In the following two matches, Caballero would score in a 3–1 home victory against Sportivo Luqueño and in a 2–1 away victory against former club Cerro Porteño, bringing his tally to four goals in four league appearances. He would not score again until two rounds later in Round 7, scoring in the 32nd minute of a 1–0 away victory against Club Universal. In the following week, Caballero scored a double in a 3–0 home victory against Cerro Corá. In Round 11, Caballero scored a double in a 3–3 home draw against Guaraní and would score one goal in the following match, a 2–1 away loss against Sportivo Luqueño, with the goal in the latter match bringing his tally to 10 league goals. Caballero would not score again until Round 16, where he would score a double in a 4–2 home victory against Club Universal on 25 June. On 9 July, he scored his 13th and last goal of the season in a 1–1 home draw against Olimpia Asunción, equalizing in the 70th minute of the match. Caballero was awarded as the league's leading goal scorer with his 13 goals, respectively.
On 1 July 2000, Caballero signed with Dundee for the 2000–01 Scottish Premier League season, being issued with the number #7. Caballero was initially on loan to the club but Dundee eventually signed him permanently. There, he was under the guidance of Italian coach Ivano Bonetti, and would also join Argentine footballers Juan Sara, Luis Alberto Carranza, Walter del Río, Claudio Caniggia and Pascual Garrido. Caballero made his first appearance in the SPL against Motherwell in a 2–0 away victory on 29 July. One week later, he scored his first goal in a 3–0 home victory against Dunfermline Athletic on 5 August. On 12 August, Caballero scored in a 5–1 away defeat against Hibernian and also received his first red card. On 23 August, Caballero scored a double in a 3–0 home League cup victory against Montrose. Four days later, he scored again in a 1–1 home league match against Heart of Midlothian on 27 August, the goal being his fifth goal in four consecutive matches. During October 2000, Dundee opted to sign Claudio Caniggia as a replacement for Caballero who had surgery to repair a damaged knee and underwent extensive rehabilitation at a Bologna clinic. Caballero scored his fourth league goal in a 2–0 away victory against Aberdeen on 7 April. On 4 May 2001, it was reported by BBC Sport that Caballero had signed a new deal which would keep him at the club for the following three seasons. The club had paid an undisclosed fee to Paraguay's Club Sol de América to make Caballero's loan deal permanent and that the sum was significant enough to top the club record of £300,000 paid for Javier Artero. He scored his last goals of the season, a double, against Celtic, in a 2–0 away victory on 13 May. Dundee were eventually eliminated by Heart of Midlothian at the fourth round stage of 2000–01 Scottish Cup. Dundee eventually finished in 6th position of the SPL table, with 47 points, and qualified for the first round of the 2001 UEFA Intertoto Cup. Caballero ended the season having scored 6 goals in 15 league appearances and 2 goals in 2 League Cup appearances.