French veteran Gael Monfils had two reasons to celebrate at the US Open on Tuesday, where he is playing the final Grand Slam event of his career.

Monfils, who made his Flushing Meadows debut in 2005, secured his place in the second round by bouncing back from a set down to beat Paraguay’s Adolfo Daniel Vallejo 2-6, 6-1, 6-2, 6-0. The former world No.6 secured the win on his 40th birthday to become the oldest man to record a victory in the main draw of the tournament since Jimmy Connors in 1992. Coincidentally, Connors ’ win was also on his 40th birthday.

“I was happy with my win,” Monfils said afterwards.

“A slow start, but I felt like I had a lot of break points, so I was not so much worried about the next set.

“It was more like for me to move my legs better. I think I was upright a lot with my body. Then somehow I got a little bit tense, but I knew that I was striking the ball well during the week, so it was a matter of time.

“When the momentum shifted, I could hold the momentum and play a great game.”

Coming into this year’s tournament, Monfils had only played two Tour-level events since the French Open. He didn’t play at Wimbledon after missing out on a wildcard and has only won one of his last three matches. He also played in the US Open mixed doubles event last week with his wife, Elina Svitolina.

Despite his lack of match play, the soon-to-be retired Frenchman is satisfied with his current form.

“I felt like I was in better shape this U.S. tour and played with the guys, found some rhythm, even though I’m not playing many tournaments, but it was important.” He explained.

“I kept going for my shots, was versatile with my backhand, and tried to use my forehand. Even though I didn’t have a high first serve percentage, I think I had a strong second serve. That allowed me to go a bit more for the first serve. So my rhythm was there.”

This isn’t the first time Monfils has marked his birthday by playing a match at Flushing Meadows. Another encounter he remembers was against Jeremy Chardy, who he defeated in straight sets. However, his most memorable birthdays has been with loved ones and not on the court.

“I won’t lie, my best birthday was with my family when I couldn’t come here playing.” He said.

“Tonight was, of course, special. Special number, 40, playing a good match, so it was special. But I think my best birthday was with my family. That definitely was the best one.

“This one I will put it in the top 10.”

Monfils will play Learner Tien in the second round.