A "tired" Roger Federer was "incredibly happy" to mark his long-awaited return with a battling victory over Dan Evans in the second round of the Qatar Open.

Swiss legend Federer had been out of action for 14 months after undergoing knee surgery, but he was back in business with a 7-6 (10-8) 3-6 7-5 win over Briton Evans.

The 20-time grand slam champion had spent a lot of time practicing with Evans in recent weeks before making his comeback and they spent another two hours and 24 minutes on court in a tight tussle on Wednesday.

Federer was delighted to be back after such a lengthy absence and the 39-year-old's next test will come against Nikoloz Basilashvili in the quarter-finals in Doha.

He said: "I was tired, I was more focused on being tired than winning the points. If I was going to go out, I was going to go out swinging. Dan had more energy left at the end but I was serving well and I thought I played a really good match. I'm incredibly happy about my performance.

"It was a pleasure to share the court with Dan and always nice to finish off with a backhand down the line on match point. The important think is how I feel tomorrow and the next day and so forth for the next six months.

"It's been a long and tough road for me. I enjoyed it though, it's been a huge challenge in my tennis career."

Top seed Dominic Thiem earlier needed three sets to defeat wildcard Aslan Karatsev 6-7 (5-7) 6-3 6-2, while the in-form Andrey Rublev was given a walkover after Richard Gasquet withdrew due to a leg injury.

Denis Shapovalov beat Vasek Pospisil in an all-Canadian encounter, while Roberto Bautista Agut was among the other winners.

Karen Khachanov reached the quarter-finals of the Open 13 Provence with a 7-6 (7-4) 6-4 win over Mackenzie McDonald, while Jannik Sinner ousted Hugo Gaston in straight sets.

Cameron Norrie, Matthew Ebden and Egor Gerasimov were also victorious in Marseille.