Serena Williams (33, United States)
2015 record: 32-1
Wimbledon record: Five titles (2002, 2003, 2009, 2010, 2012), 2 Runners up (2004, 2008)
Serena is halfway to a true Grand Slam and, as she prefers to see it, three-quarters of the way to a self-styled "Serena Slam," having won the past three major tournaments in a row. Williams hasn't been past the fourth round either of the last two years at the All England Club.
Petra Kvitova (25, Czech Republic)
2015 record: 24-7
Wimbledon record: Two titles (2011, 2014)
left-hander with a big serve and flat forehand consistently produces her best Grand Slam results on the grass at the All England Club, making it to at least the quarterfinals each of the last five years, including two titles.
Maria Sharapova (28, Russia)
2015 record: 29-6
Wimbledon record: One title (2004)
Won her first Grand Slam title as a 17-year-old at the All England Club more than a decade ago. Since then, though, Sharapova has returned to the championship match at the All England Club only once in 10 appearances.
Eugenie Bouchard (21, Canada)
2015 record: 8-13
Wimbledon record: 1 Runner Up (2014)
After making it to at least the semifinals at the first three majors a year ago, including Wimbledon, she’s taken a significant step backward this season. lost 10 of 11 matches in one stretch this year, including a first-round exit at the French Open.