NEW YORK -- Alexander Zverev rallied just in time to avoid becoming the first men's No. 1 seed to lose in the first round of a Grand Slam tournament since 2003, edging Lorenzo Sonego 6-4, 3-6, 6-7 (7), 7-5, 6-4 in a US Open match that ended Wednesday morning.
Zverev couldn't cash in on repeated chances to break Sonego's serve for much of the night and was in danger of becoming the first top-seeded man to fall in his first match in a major since Ivo Karlovic beat Lleyton Hewitt at Wimbledon in 2003.
It hasn't happened at the US Open since Stefan Edberg lost to Alexander Volkov in 1990. Zverev finally broke through against Sonego's serve late to pull out the match in 4 hours, 52 minutes.
"Nearly five hours for a first round, I think this is the longest first-round match I've ever played in my life," Zverev said. "So, credit to him. He played amazing tennis today, would have beaten a lot of players for sure, but I'm happy to be through."