What results is a more accurate version of the real drama of each match. For example, here is the graph for the round 1 match between Serena Williams and Alison Lim. Serena went into the match with a win probability of 98.4%, and the line barely budged from that number as Serena won in straight sets 6-2, 6-2.
And here is the graph from Ernests Gulbis' upset over Roger Federer. Gulbis began the game with a 36% win probability, and saw his chances fall to 7% midway through the second set, before battling back to win in five sets.