In the last hour two seeds were forced to retire from their first round matches through unfortunate injury.
Number 16 seed Tommy Haas was forced to retire 5-2 up in the first set - Estonian Jurgen Zopp in his first round encounter today. Zopp will now face Dusan Lajovic in the second round.
Haas has been having injury problems on and off for a fair time now, having to retire in Rome last week versus Grigor Dimitrov with a recurring shoulder injury. One has to think the German is now into the twilight of his career, with injuries ruining any chance of him progressing into latter stages of tournaments. It wouldn't be at all surprising if this was Haas's last season on the ATP tour.
In more surprising news, Spaniard Nicolas Almagro who was scheduled to meet defending champion Rafael Nadal in the 4th round, also retired with an unknown injury 0-5 down in the first set to American Jack Sock.
This eliminates two potential opponents for Nadal going forward and means that one of Jack Sock, Dusan Lajovic, Steve Johnson, Laurent Lokoli or Jurgen Zopp will make the round of 16 in unlikely circumstances.
Sock will now go on to face either fellow American Steve Johnson or breakout French youngster Laurent Lokoli in the second round.