Novak Djokovic has on Monday achieved another milestone in his career, overtaking Steffi Graf’s record for most weeks by a men or women tennis player as world No. 1.

Novak returned to No. 1 last month for the first time since last June by winning a record-extending 10th Australian Open crown.

“With your love and strength that you have given me over the years, I’ve managed to get many fantastic achievements,” Novak said in a video for the fans. “The most recent one (is) breaking the record (with) 378 weeks as No. 1 (in the) rankings, surpassing one of the greatest, most legendary tennis players — both men and women — that ever played, Steffi Graf. So I’m flattered, obviously extremely, extremely proud and happy for this achievement.”

“It’s surreal to be that many weeks No.1, to match Graf,” Novak said. “Just being amongst these legendary names is flattering. I’m proud of it.”

Written with inputs from Reuters