'Be quiet and watch, don't say anything' - Djokovic fumes at his team

It's just not happening for Djokovic. Sinner broke back to make it 2-3, and Djokovic was visibly frustrated.

It could have easily been 4-0 to the Serb, but that's tennis; one point can change everything.

Djokovic's children, Stefan and Tara, are in attendance. The camera frequently showed a disappointed Stefan, understandably upset by his father's struggles.

However, Sinner is playing at an extremely high level, showcasing why he's one of the top players in the world. Djokovic's wife, Jelena, and their nanny are also present.

As for the coaching staff, Charlie Gomez, Djokovic's team manager, is there. Dušan Vemić is in the main coaching chair for this tournament, alongside Boris Bošnjaković, who serves as an analyst. Dalibor Sirola and Claudio Cimalja are also present as fitness coaches.

The tennis star gave them a stern warning during the game, as reported by Sportal, "Watch and be quiet, don't say anything! Don't you say a word."

Sinner took the first set in London 6-3 and then repeated the feat in the second.

However, a match at this same venue three years ago provides a glimmer of hope for Djokovic.

In the Wimbledon quarterfinals that year, Djokovic also lost the first two sets to Sinner but then mounted an incredible comeback to win 3-2 (5-7, 2-6, 6-3, 6-2, 6-2).

Djokovic proved that the old soccer adage, "2-0 is the most dangerous lead," also applies to tennis. Let's hope it holds true again today.