There are certainly a lot of tennis fans in Costa Rica and this Sunday they will be treated to a great final game of the US Open 2016 when Novak Djokovic faces Stan Wawrinka who reaches his first US Open final after defeating Japanese No. 6 seed Kei Nishikori in four sets.

Serbian world No. 1 Novak Djokovic advanced to the U.S. Open final with a 6-3, 6-2, 3-6, 6-2 victory Friday over Frenchman Gael Monfils in a match that featured occasionally bizarre shifts in momentum and tactics.

The two-time champion raced out to a 5-0 lead in the first set, but the 10th-seeded Monfils won three straight games and had a break point to get back on serve by giving Djokovic a steady diet of slow slices and then counterpunching effectively when the Serbian tried to attack the net.

The strategy worked for a few games, although Djokovic righted the ship in time to hold serve and clinch the set and then looked like he was cruising to an easy victory when he grabbed a 6-3, 6-2, 2-0 lead.

The mercurial Frenchman, however, stormed back to win six of the next seven games by adopting a much more aggressive approach, striking 14 winners to Djokovic’s five to take the third set in 41 minutes.

But toward the end of that set Monfils started bending over at the waist and showing signs that he was either ill or struggling with his fitness.

That gave a clear edge in the fourth set to Djokovic, who wrapped up the victory in two hours and 32 minutes even though he called for the trainer to receive treatment on his shoulder during the contest.

With the win, the 29-year-old Djokovic, a two-time U.S. Open champion in 2011 and 2015, advanced to his seventh final at this hard-court Grand Slam event and his sixth final in the past seven years.

Next up for the Serbian in the final against Swiss No. 3 seed Stan Wawrinka. EFE