"It was interesting six weeks ago only 50 percent of the global playing group. Today more than 85 percent are," Tennis Australia CEO Craig Tiley said.

He passes Janko Tipsarevic for most Davis Cup singles wins for a Serbian player since the Serbian team started competing at the event in 1995.

Serbia, led by the 20-time Grand Slam champion, will play its first group tie on Friday against home team Austria.

On Saturday, Zverev more successfully balanced aggression and margin, and moved into the championship contest in Turin.

“When we’re in a state where there’s more than 90 percent of the population fully vaccinated, it’s the right thing to do,” the Tennis Australia CEO told “The Today Show” Saturday morning from Melbourne.

And 39 of his last 40, too.

Djokovic enters the semifinal round as a three-game favorite over Zverev.

Only Jimmy Connors and Roger Federer had previously achieved the incredible feat.

The former world No. 1 said in an interview that the Serbian is clearly the GOAT.

The Serbian conducted a brilliant 6-3, 6-2 performance against Andrey Rublev at the ATP Finals Wednesday and caught up with Prakash Amritraj afterwards in Turin.