The recently retired Andy Murray is going to team up with longtime rival Novak Djokovic as his coach, they both announced, with plans to prepare for — and work together through — the Australian Open in January.

It was a stunning bit of news as tennis moves toward its offseason, a pairing of two of the most successful and popular players in the sport, both of whom are sometimes referred to as members of the so-called Big Four that also included Roger Federer and Rafael Nadal.

Djokovic is a 24-time grand slam champion who has spent more weeks at No.1 than any other player in tennis history.

READ MORE: Stunning moment sums up India’s bold new approach

READ MORE: Smith takes PGA Champs lead as home crowd erupts

READ MORE: Carey’s ‘insulting’ downplay of events leaves ex fuming

Murray won three major trophies and two Olympic singles gold medals and finished 2016 atop the ATP rankings. He ended his playing career after the Paris 2024 Olympic Games in August.

Both men are 37 and were born a week apart in May 1987.

They started facing each other as juniors and wound up meeting 36 times as professionals, with Djokovic holding a 25-11 advantage.

“We played each other since we were boys — 25 years of being rivals, of pushing each other beyond our limits. We had some of the most epic battles in our sport. They called us game-changers, risk-takers, history-makers,” Djokovic posted on social media over photos and videos from some of their matches.

“I thought our story may be over. Turns out, it has one final chapter. It’s time for one of my toughest opponents to step into my corner. Welcome on board, Coach — Andy Murray.”

Djokovic’s 2024 season is over, and it was not up to his usual, high standards. He didn’t win a grand slam trophy; his only title, though, was meaningful to him: a gold medal for Serbia in singles at the Summer Games.

Djokovic has been without a full-time coach since splitting in March from Goran Ivanisevic.

“I’m going to be joining Novak’s team in the offseason, helping him to prepare for the Australian Open,” Murray said in a statement released by his management team.

“I’m really excited about it and looking forward to spending time on the same side of the net as Novak for a change, helping him to achieve his goals.”

Their head-to-head series on tour includes an 11-8 lead for Djokovic in finals and 8-2 at grand slam tournaments.

Djokovic beat Murray four times in the Australian Open final alone — in 2011, 2013, 2015 and 2016.

Two of the most important victories of Murray’s career came with Djokovic on the other side of the net.

One was in the 2012 US. Open final when Murray claimed his first grand slam title. The other was in the 2013 Wimbledon final when Murray became the first British man in 77 years to win the singles championship at the All England Club.

Next year’s Australian Open starts on January 12.