London, June 18 -- Top two seeds Carlos Alcaraz and Jack Draper both advanced to the second round of the men's singles at the Queen's Club Championships.

Spain's Alcaraz arrived in London fresh off his second consecutive French Open title.

The world No. 2 overcame a late challenge from lucky loser Alex Walton to win his first grass-court match of the season 6-4, 7-6(7) on Tuesday.

Alcaraz had initially been scheduled to face fellow Spaniard Alejandro Davidovich Fokina in the opening round, but the world No. 28 withdrew just hours before the match due to illness following his recent wedding.

"I didn't know his game, which shot is his best," Alcaraz talked about his opponent Walton from Australia.

"What I tried is not to think about...