Juan Martin del Potro overcame delays from the rain and his opponent to pull out a grueling four-set win in the first round of the US Open.
The 2009 champion was frustrated by 74th-ranked Guillermo Garcia-Lopez's repeated calls for a trainer to work on his left leg. Del Potro, seeded sixth, rallied from a break down in the last set Wednesday to win 6-3, 6-7 (5), 6-4, 7-6 (7) in 4 hours, 13 minutes.
The Spaniard saved three match points in the final tiebreaker before del Potro put him away with an emphatic backhand winner.
Garcia-Lopez upset 10th-seeded Juan Monaco in a fifth-set tiebreaker in the first round at Flushing Meadows last year.
No. 17 Kevin Anderson, No. 21 Mikhail Youzhny and 109th-ranked American wild-card entry Tim Smyczek were among the other men's winners Wednesday.