Japanese wheelchair tennis star Tokito Oda won his second consecutive French Open and fourth Grand Slam singles title Saturday, defeating Argentina’s Gustavo Fernandez 7-5, 6-3 in the final. The 18-year-old left-hander closed the match by breaking Fernandez’s serve at love at the same Roland Garros venue where Paralympic tennis will be played this summer. Oda has now won this year’s first two Grand Slams. A win at the U.S. Open will complete a career Grand Slam. “It’s always tough to play against you,” Oda said of his opponent in a post-match on-court interview. “You have so much power, so I t…