McFarlane began to establish himself as a senior level athlete in the 2013 season. At the 2013 South American Championships in Athletics he set a personal best of 13.85 seconds to take fourth place in the hurdles, while his brother won in a Peruvian record time. Both were also in action in the long jump, with Javier coming eighth. Two senior medals followed at the Bolivarian Games, held on home turf in Trujillo, where he was third in the hurdles and second in the long jump (Jorge won both). The 2014 South American Games marked a coming of age for 22-year-old as he claimed his first senior gold medal in the 110 m hurdles in a personal best time of 13.77 seconds. He was also fifth in the long jump, beating his brother in both disciplines. The hurdles final at the 2014 Ibero-American Championships in Athletics proved to be a family affair as Jorge beat Javier to the title by a margin of five hundredths of a second. The winning time of 13.53 was a national record and Javier McFarlane's 13.57 seconds was a personal best – a very slow reaction time from Javier proved to be the difference between the two. He ended his season at the Pan American Sports Festival, coming fourth in the hurdles and ninth in the long jump.