Second-seeded Roger Federer narrowly avoided another upset, edging Marin Cilic 7-6 (5), 6-7 (3), 6-4. Djokovic came in with 11 straight wins over Tsonga but was nowhere near adding a 12th.
"Just nothing was going," Djokovic said. "No baseline, no serve, no return. So just generally (a) very bad day, very poor performance."
Tsonga's serve gave Djokovic plenty of trouble. The Frenchman had only eight aces, but Djokovic continually struggled to keep his returns in play.
"It's not every day you get the rewards of what you're doing every day during the year," he said. "You leave your family, practice every day hard, suffer a lot on the court. And when you win a match like this, you just feel good."
Djokovic never looked comfortable in Toronto, his first tournament since winning Wimbledon last month. Four days later, he married his longtime girlfriend. On Wednesday, Djokovic needed three tough sets to outlast Gael Monfils 6-2, 6-7 (4), 7-6 (2) in the second round.
Tsonga will play eighth-seeded Andy Murray in the quarterfinals. Murray advanced when third-round opponent Richard Gasquet withdrew because of an abdominal strain. Djokovic's loss was the second big upset of the day. Third-seeded Stan Wawrinka lost 7-6 (8), 7-5 to Kevin Anderson.
Anderson will play seventh-seeded Grigor Dimitrov, a 7-5, 5-7, 6-4 winner over Tommy Robredo.
Canada's Milos Raonic also advanced, beating Julien Benneteau of France 6-3, 4-6, 6-4. The sixth-seeded Raonic, coming off a tournament victory Sunday in Washington, will play Feliciano Lopez in the quarterfinals. The Spaniard beat Tomas Berdych 3-6, 6-3, 6-4.
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