The Laver Cup delivered incredible action over the three-day period, entertaining the crowd present at the United Center in Chicago, as well as the millions watching worldwide.Team World vs Team Europe, with some of the elite names leading the charge from both fronts, guaranteed the tennis faithful witnessed some breathtaking moments, eventually seeing the defending champions successfully hold on to their title. Roger Federer, one of the greatest of all-time, who has been associated with the tournament since its inception last year, is a pivotal part of Team Europe.On Sunday, during the match between Alexander Zverev and Kevin Anderson, Federer was seen in a different light which inferred why he is regarded so highly in the sport.Federer was watching Zverev in action at court-side with Team Europe on the verge of securing the second Laver Cup in as many years.A win would see Team Europe take an unassailable 13-8 lead over their rivals, but the German youngster had already lost the first set and was struggling for control in the second.Wimbledon finalist Anderson, known for his menacing serve, was dominating proceedings and right then Federer stepped in providing the best coaching advice to Zverev that completely changed the scenario.The Swiss maestro told the 21-year-old: “Find your return position, but then once the rally gets going, you have to remind yourself to keep your position or move forward - but stop moving back and back and back.“That's why he's able to get to these volleys, because he has too much time, he gets that metre or two too close to the net, or you give him that one more split second of time to just get his legs in position to run around.“So, if you can be closer on the baseline, he won't have that time. That's my opinion.“Because you slice, and you run back. So just stay in position, because then you can also see the short balls. Back there you don't have any short balls, so it's hard to stay offensive.”Watch the video below!The pep talk proved fruitful and on serve at 5-4 at the time, the world number five broke Anderson a few minutes later to win the second set.

Moments after the contest, Zverev joked about the 20-time Grand Slam champion, saying: “Roger is not a good coach...!

“No, he helped me a lot. He gave me some tactical advice and he told me how to play, and it worked. I won the second set and won the match tie-break.”