There is often a point in a tennis match when both players have approximately equal odds (close to 2.0), e.g. 1.98 and 2.02.
Then the positions of the players begin to get wider apart, e.g. the favourite regains his/her breath and wins the next several games, or the underdog asserts his/her hidden potential and is heading for a win.
At that very moment, you need to back the player whose price has dropped from ~2.0 and lay the other player, whose price obviously raised above 2.0.
Then aim to green up both bets or distribute the loss if the bet was not traded out within the specified time.
Capitalizing on tennis players with equal odds