Juan Martin del Potro, Milos Roanic, John Isner all through in Delray Beach

Juan Martin del Potro celebrates

Second seed Juan Martin del Potro eased past Jeremy Chardy in his opening match at the Delray Beach Open while Milos Raonic and John Isner also advanced.

Former US Open winner Del Potro beat the Frenchman 6-2, 6-4 in just over an hour in Florida on Tuesday.

He broke Chardy twice in the opening set, but he then found himself 0-2 behind in the second as his opponent got off to a flyer. However, the former Delray Beach winner immediately broke back and made it 2-2 on his own serve before claiming the decisive break in the seventh game.

Former Wimbledon runner-up Raonic was too good for Taro Daniel from Japan as he won 6-1, 7-5 to set up a clash with Steve Johnson, who beat Nikoloz Basilashvili 6-3, 6-4.

Isner, though, didn’t have it all his own way as he had to come from a set down to beat Radu Albot 5-7, 6-3, 6-4 while Denis Shapovalov was also made to work for his 7-5, 7-6 (7-4) victory by veteran Ivo Karlovic.

Fourth seed Sam Querrey was the biggest casualty as he was beaten 2-6, 6-3, 7-6 (7-4) by his American compatriot Taylor Fritz, who was playing in his first ATP Tour match of 2018.

“I didn’t even know it was my first tour-level match of the year,” Fritz told ATPWorldTour.com. “I felt ready. I did well in the Challengers I played this year… took last week off, was training hard, and I felt ready.”

Meanwhile, Frenchman Adrian Mannarino withdrew from the tournament stating that his body “body need rest”.