That run brought him back to No. 22 in the world, and his ranking yo-yoed up and down through the 20s from there until the US Open. Along the way, Nishikori reached the round of 16 at the French Open and the quarterfinals of Wimbledon for the first time.
In New York, the 2014 finalist exacted revenge upon Cilic—who beat him in that championship bout back then—in the quarterfinals before Djokovic halted his run.
Nishikori’s first semifinal at a major in two years put him within striking distance of the top eight to qualify for the season-ending championships. With a slew of players ranked ahead of him, Nishikori did his part to enhance his chances of making the tournament for the fourth time in his career.
A semifinal appearance in Metz, France, was followed by a runner-up finish at the Japan Open, where he lost to young Russian Daniil Medvedev. At the Shanghai Masters, Roger Federer halted his progress in the quarterfinals. However, a pattern appeared to be established as Nishikori followed that loss up with another final—his third of the year—in Vienna, Austria, where Kevin Anderson topped him.
After finishing up the regular season with a quarterfinal run at the Paris Masters, Nishikori moved into the London field with the expected withdrawal of Juan Martin del Potro, who injured his leg in Shanghai.
Like the Argentine, Nishikori has dealt with a number of medical issues over the course of his career, which has hindered his progress. But he’s been healthy for a good portion of this year and in London, he’ll be looking to end his personal title drought: Nishikori’s dropped his last nine finals since winning in Memphis two years ago.
In the round-robin portion of the finals, he’ll be grouped with Dominic Thiem, Federer and Anderson. Nishikori has a combined 8-4 record against Thiem and Anderson, while he’s 2-7 against Federer.
A strong showing isn’t outside the realm of possibility for the best male player in Japan’s history. Considering how far he’s come this year, the season is already a success and the potential for more is only a few matches away.