Alcaraz stumbles in first match as No. 1 player

Alcaraz stumbles in first match as No. 1 player

ASTANA, Kazakhstan -- 's first match as the No. 1-ranked player ended with a straight-sets loss to at the Astana Open on Tuesday.

Alcaraz, 19, lost 7-5, 6-3 in his first tour match since winning the US Open and capturing the No. 1 ranking.

"David was playing really, really well. To come back to competition is never easy," Alcaraz said. "It's really tough for me, for my confidence."

Alcaraz came from 5-2 down to level the first set at 5-5, only to be broken again by his Belgian opponent.

"When you play against the World No. 1 on a big stage, big crowd, the fire inside gives you so much power to play your best tennis because you don't have any choice," Goffin said. "You have to fight and give your best and that was the case today."

Second-seeded and No. 3-seeded both avoided similar upsets. Medvedev beat of Spain 6-3, 6-1 and Tsitsipas ousted Kazakhstan's 6-3. 6-4.