Marin Cilic struggled early before finding his rhythm as the top seed ground out a 4-6, 6-2, 6-3 victory over friend and Croatian compatriot Ivan Dodig in the first round of the Memphis International on Monday.
The top seed is bidding for a second successive title after winning in Zagreb last week and opened his campaign against a familiar foe in Dodig, the pair growing up in the same neighbourhood and often practicing together.
Cilic was the only seeded men's player to take to the court on a quiet day with third and fourth-seeded John Isner and Sam Querrey scheduled to open their campaigns on Tuesday.
Aside from Cilic, American Rhyne Williams beat countryman Steve Johnson 7-6, 6-4 while Poland's Lukasz Kubot outlasted another American, Ryan Harrison, 6-4, 6-7, 7-6.
In the women's draw, the top two seeds, Kirsten Flipkens and Sofia Arvidsson, eased into the second round with straight-sets victories.
In the day's final match, eighth-seeded Frenchwoman Kristina Mladenovic needed less than an hour to dispatch American Courtney Collins 6-3, 6-1.
Photograph: Feng Li/Getty Images