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.

β€œI just need to keep working and keep going,” Khachanov told Sky Sports.

β€œI 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.

β€œI 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.