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 on Tuesday.

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).

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 him but myself. I tried to play as good as I can and that's all."

Earlier, Draper thrilled the home crowd at Andy Murray Arena with a commanding 6-3, 6-1 victory over American Jenson Brooksby.

"I feel good. I feel confident. I feel relaxed. Like I said on court, I'm happy to be home. I'm happy to be playing in front of home crowd," said the 23-year-old British No. 1.

Draper will next face Australian Alexei Popyrin, while Alcaraz is set to play compatriot Jaume Munar.