Is Serena Really a Lock?

Everyone is saying that this is Serena’s tournament to lose, but is that fair?

Serena has lost to both Dinara Safina and Jelena Jankovic this year. She lost to Safina at the Qatar Telecom German Open, a match which ended in a third-set tiebreaker. And she lost to Jankovic at the Australian Open in straight sets (though Serena has also recently beaten her, at the Sony Ericsson Open).

Safina and Serena are underway now at Ashe, and Safina is up a break. So there. Is Serena Really a Lock?