Boris Becker has lauded Novak Djokovic's incredible longevity in the sport after he achieved his record 24th Grand Slam title at the US Open.

36-year-old Djokovic showed no signs of winding down anytime soon at the last major of the year in New York last week. The Serb had already lifted the trophy at the Australian Open and French Open earlier this year to move ahead of Rafael Nadal's total of 22 Slam titles.

Although he lost to Carlos Alcaraz in the final of Wimbledon, Djokovic came back strong at Flushing Meadows, defeating all but one of his opponents in straight sets on his way to the final. Once there, he ousted Daniil Medvedev 6-3, 7-6 (5), 6-3. In doing so, he equaled Margaret Court's all-time record of 24 Grand Slam titles.

Former World No. 1 Becker - who coached Djokovic to six Grand Slam titles and 14 ATP Masters 1000 titles between 2014 and 2016 - praised the Big Three member's ability and longevity on the Eurosport Germany podcast Das Gelbe vom Ball.

"There is nothing that surprises me about Novak Djokovic anymore," he said, "But that at 36 he still has the motivation, that he has the desire, that he has the leisure and invests the time...I mean, he doesn't have to prove anything to anyone anymore.

"Now he has reached Margaret Court with 24 Grand Slam titles and is the oldest Grand Slam winner. That's quite extraordinary."

Becker continued by saying that he used to think such records would never be broken but that Djokovic keeps "pushing the limits" of the sport.

"A few years ago, I thought that such records could not be broken at all, because at some point you are physically and mentally too old for competitive sports.

"But there again, Novak Djokovic is pushing the limits. I think all of us who love tennis, who also respect him, are a bit speechless," he added.