I'm looking at top-10 seeded players that could possibly lose in the first round.
ATP
1) Nadal: He faces Coric who beat him last year.
WTA
1) Sharapova: She faces Gavrilova who beat her this year on hard court. Plus Sharapova hasn't played much tennis since Wimbledon.
2) Ivanovic: She faces an unpredictable Cibulkova who can beat any player when she's on her game.