Serena Williams returns to the U.S. Open this week, not with the first grand slam in 27 years on the line this time, but rather a chance to surpass Steffi Graf for the most grand slam titles of all time. Four of the five SI tennis writers who were asked for their opinions predicted someone other than Serena will win. ...Check out SI.com's analysis of the men's draw and the women's draw. ... Here's what to expect on the first day. ... Beyond the favorites, here are six players who could make a run at the titles.