Karen Khachanov lifted his second ATP World Tour title with a 7-5 3-6 7-5 victory over Lucas Pouille at the Open 13 Provence in Marseille.

Khachanov has now won both of his two tour-level finals after triumphing at the inaugural Chengdu Open in 2016.

The Russian world number 47 hit 16 aces in the 109-minute contest to outlast home favourite Pouille, the recent Open Sud de France champion.

“I just need to keep working and keep going,” Khachanov told Sky Sports.

“I think both of us played a good match, really solid, and just a few points made the difference.”

Frances Tiafoe beat Peter Gojowczyk 6-1 6-4 to win the Delray Beach Open in Florida.

Tiafoe, 20, needed just over an hour for victory and becomes the youngest American to win an ATP World Tour title since 19-year-old Andy Roddick at Houston in 2002.

“I just can’t believe it. If you would have asked me 10 years ago if I was going to win a title at 20 years old, I probably would have laughed,” Tiafoe said.

Diego Schwartzman, from Argentina, overcame Fernando Verdasco 6-2 6-3 to be crowned the Rio Open champion for the biggest title of his career.