vsbabolat
G.O.A.T.
Tsonga wasn't influenced by money or country of origin. He approached Babolat after hitting with Nadal's racquet during a practice session and feeling it was much better than the Wilson he had. And a player can break a contract any time he/she feels like it, simply by threatening to blame his/her poor play on his/her racquet on Facebook and Twitter. Wozniacki voided her Yonex contract in just this way recently. The company could never get enough money from the player (likely they would get none, or $1, as it is hard to prove actual cost) to reflect the actual damage done to the brand.
Tsonga waited until his Wilson contract was up to switch to Babolat. That is why he played with the Kobra Tour at the end of it.