 Keizer and van Iersel did not medal on the World Tour in 2013; their highest finish was a fifth at the $220K The Hague Grand Slam.They also took part in the European Championships, advancing to the Round of 16 where they lost the deciding set against their compatriots Jantine van der Vlist and Marloes Wesselink.After 11 years competing on the World Tour, Keizer decided to retire at the end of 2013 to focus more on her personal life and police work.