The flamboyant Frenchman has fallen short at major tournaments, despite his obvious talent, but has seen a remarkable turnaround in fortunes under the guidance of Swedish coach Mikael Tillstrom.
Monfils, 30, has shown more consistent form this year, winning his first ATP World Tour 500 Series singles title in July, before reaching the semi-finals at the US Open, losing a very strange match to Novak Djokovic.
He defused the big serving Ivo Karlovic to win that maiden crown in a regular warm-up event to Flushing Meadows, the Washington Open, which was his first singles title in over two years.
Monfils was also beaten by Djokovic in the semi-finals of the Rogers Cup and then advanced to the quarter-finals of the singles tournament at the Rio Olympics, losing a close fought match with Kei Nishikori and was most recently knocked out at the semi-final stage of the Japan Open.
He was also a beaten finalist at the Monte Carlo Masters and reached the quarter-finals of the Australian Open. He missed the French Open through injury before a surprise first round defeat at Wimbledon.