WATCH: Ronaldo makes appearance at ATP Finals

Another Spaniard seems to have replaced World No. 2 Rafael Nadal at the ATP Finals in London, but it’s not a tennis player.

Cristiano Ronaldo was spotted trying to catch a ball in the stands during Day 2 action.

On Monday, Rinaldo watched Novak Djokovic ease past John Isner, 6-4, 6-3. That day also saw the youngest player in the field, Alexander Zverev, beat Marin Cilic in two tiebreak sets.

On Tuesday in Group Lleyton Hewitt, Kevin Anderson swept Kei Nishikori, dropping only a game in a 6-0, 6-1 victory. Roger Federer later earned a decisive victory over Dominic Thiem, 6-2, 6-3. Federer and Anderson currently lead their group, and are set to face off on Thursday night.

In Group Guga Kuerten, leaders Djokovic and Zverev went head-to-head on Wednesday, with the Serbian prevailing, 6-4, 6-1.

Whether or not Ronaldo will make another appearance for the remainder of the event is up in the air, but fans can still look forward to seeing more competitive matches as the year-end tournament nears its conclusion.

This Week on Tennis Channel:

ATP Finals (Sun - Sun 11.11 - 11.18) - Novak Djokovic, Roger Federer and the world's best collide in the season Finale. Live coverage begins on Tennis Channel Sunday at 7:00am EST.