Djokovic is playing a grasscourt warmup tournament for the first time in seven years and looked relaxed as he walked about in the south coast sunshine on Monday.
Serena Williams may be missing from this year's French Open, but big sister Venus is still going strong and marks her Roland Garros 20th anniversary on Sunday.
The 32-year-old Tsonga will open his campaign at Roland Garros -- where he twice reached the semi-finals -- against Argentine Renzo Olivo, a first round casualty in Lyon.
Zverev, 29, had been bidding for his maiden tour title the 33rd-ranked player`s first final appearance in seven years.
The 17-year-old Abhimanyu tamed the fighting Japanese 6-1 4-6 6-1 in two hours and 15 minutes at court number six of Roland Garros.
The 20-year-old Alexander Zverev beat Novak Djokovic to win the Italian Open last Sunday, while the 23-year-old Dominic Thiem also impressed in the tournament, defeating Nadal.
American eight-times grand slam champion Agassi, 47, has taken on a coaching role for the first time since ending his glittering playing career in 2006.
Nadal, who was forced to withdraw from last year's Roland Garros with a wrist injury after two rounds, has already reached the magical 10 titles number this year at the claycourt events in Monte Carlo and Barcelona.
Kvitova, who said this week she was set to play at Wimbledon where she has twice won the title, has not played competitively since the attack, which left her with serious injuries to her left playing hand.
World number one Andy Murray is seeded to face 2015 champion Stan Wawrinka in the last four.
The Spanish star withdrew from the 2016 tournament with a left wrist injury on the eve of his third round match.
Simona Halep, the 2014 runner-up, established herself as arguably the leading challenger by winning the Madrid Open before reaching the Rome final, but an ankle injury has cast doubt over her status.
The 30-year-old has already reached the magical 10 titles number this year at the claycourt events in Monte Carlo and Barcelona.
The Indo-American team will face next face top seeds Jean- Julien Rojer of The Netherlands and Romania's Horia Tecau in the final four contest.
Djokovic on Sunday named former world number one Agassi as his coach for the French Open, which starts May 28, minutes after losing the Italian Open final to Alexander Zverev 6-4, 6-3.
The champion in 2005, 2006, 2007, 2008, 2010, 2011, 2012, 2013 and 2014, Nadal, now 30, was written off when he lost to Novak Djokovic in the 2015 quarter-finals, ending a 39-match win streak in Paris since his shock defeat to Robin Soderling in 2009.