Some context: Hardy was born in Cameron, North Carolina, the son of Gilbert and Ruby Moore Hardy. He is the older brother of Jeff Hardy. Their mother died of brain cancer in 1986. Hardy played baseball as a child and throughout high school, but had stopped by his senior year.
At the beginning of 2002, it seemed Team Xtreme had patched things up. After the brand extension, however, Hardy was relegated to Heat while Jeff wrestled on the main show, Raw. On the August 12 episode of Raw, Hardy turned against Jeff during Jeff's match against Rob Van Dam, because Hardy was frustrated at not receiving a match against Van Dam for the number one contendership for the Intercontinental Championship. A short time later, Hardy joined the SmackDown! roster, and began dubbing himself "Matt Hardy: Version 1", complete with a "version 1" hand signal. Hardy defeated The Undertaker on the September 12 and October 3 episodes of the show, due to interference from Brock Lesnar.  Along with his MF'er (Mattitude Follower) Shannon Moore in his corner, 2003 began with Hardy frantically trying to lose weight to get under the 215 lb (98 kg) weight limit to compete for the Cruiserweight Championship. After just barely making weight, Hardy defeated Billy Kidman at No Way Out to win the Cruiserweight title. At WrestleMania XIX, he successfully defended it against Rey Mysterio. Hardy lost the Cruiserweight Championship to Mysterio in the main event of the June 5 edition of SmackDown - the first and only time a Cruiserweight Championship match main evented a show.  After dropping the Cruiserweight Championship, Hardy briefly feuded with Eddie Guerrero, but was unsuccessful in capturing Guerrero's United States Championship or Tag Team Championship. The Mattitude faction then expanded to include Crash Holly as Moore's "Moore-on" (apprentice). He later disbanded the group in November and returned to Raw in order to be able to travel and work with his then girlfriend Lita, who just returned from an injury. On his first night back, he turned on Lita in storyline after teasing a proposal to her. He defeated Christian, who was vying for Lita's affections, on the following edition of Raw.  In April 2004, Hardy saved Lita from getting attacked by Kane. Hardy defeated Kane at Vengeance, but lost a match against Kane at SummerSlam. On the August 23 episode of Raw, Hardy was chokeslamed off the stage by Kane. Hardy then spent almost a year off from wrestling due to a severe knee injury.
Then did he try another fighter?
A: At WrestleMania XIX, he successfully defended it against Rey Mysterio.

Some context: Oscar Leonard Carl Pistorius was born to Henke and Sheila Pistorius on 22 November 1986 in Sandton, Johannesburg, in what was then Transvaal Province (now Gauteng Province) of South Africa. He grew up in a Christian home and has an elder brother, Carl, and a younger sister, Aimee. Pistorius credits his mother, who died at the age of 43 when Pistorius was 15 years old, as a major influence in his life. Pistorius is a white South African with Italian ancestry from his maternal great-grandfather, who was an Italian emigrant to Kenya.
Pistorius has been the subject of criticism because of claims that his artificial limbs give him an advantage over runners with natural ankles and feet. He runs with J-shaped carbon-fibre prosthetics called the "Flex-Foot Cheetah" developed by biomedical engineer Van Phillips and manufactured by Ossur.  On 26 March 2007, the IAAF amended its competition rules to include a ban on the use of "any technical device that incorporates springs, wheels or any other element that provides a user with an advantage over another athlete not using such a device". The IAAF stated that the amendment was not specifically aimed at Pistorius. To decide whether he was running with an unfair advantage, the IAAF monitored his track performances using high-definition cameras to film his race against Italian club runners in Rome on 13 July, and his 400 metres in Sheffield on 15 July 2007, at which he placed last.  In November 2007, Pistorius was invited to take part in a series of scientific tests at the Cologne Sports University under the guidance of Professor of Biomechanics Dr Peter Bruggemann in conjunction with Elio Locatelli, who was responsible with the IAAF of all technical issues. After two days of tests, Bruggemann reported on his findings on behalf of the IAAF. The report claimed that Pistorius's limbs used 25% less energy than runners with complete natural legs to run at the same speed, and that they led to less vertical motion combined with 30% less mechanical work for lifting the body. In December, Bruggemann told Die Welt newspaper that Pistorius "has considerable advantages over athletes without prosthetic limbs who were tested by us. It was more than just a few percentage points. I did not expect it to be so clear." Based on these findings, on 14 January 2008, the IAAF ruled Pistorius's prostheses ineligible for use in competitions conducted under the IAAF rules, including the 2008 Summer Olympics. Pistorius called the decision "premature and highly subjective" and pledged to continue fighting for his dream. His manager Peet van Zyl said his appeal would be based on advice from United States experts who had said that the report "did not take enough variables into consideration".  Pistorius subsequently appealed against the adverse decision to the Court of Arbitration for Sport (CAS) in Lausanne, Switzerland, and appeared before the tribunal at the end of April 2008. After a two-day hearing, on 16 May 2008, the Court of Arbitration for Sport upheld Pistorius's appeal and the IAAF council decision was revoked with immediate effect. The CAS panel unanimously determined that Dr Bruggemann tested Pistorius's biomechanics only at full-speed when he was running in a straight line (unlike a real 400-metre race); that the report did not consider the disadvantages that Pistorius suffers at the start and acceleration phases of the race; and that overall there was no evidence that he had any net advantage over non-disabled athletes. In response to the announcement, Pistorius said: "My focus throughout this appeal has been to ensure that disabled athletes be given the chance to compete and compete fairly with non-disabled athletes. I look forward to continuing my quest to qualify for the Olympics."
What caused the dispute?
A:
He runs with J-shaped carbon-fibre prosthetics called the "Flex-Foot Cheetah"