On December 31, 2011, Lendl was appointed to coach Andy Murray. Lendl has been credited with improving Murray's maturity and consistency, guiding him to his first two Grand Slam victories in the 2012 US Open and 2013 Wimbledon Championships. On winning the US Open in 2012, Murray became the second player in the Open Era, after Lendl, to have lost their first four Grand Slam finals, and won the fifth. On March 19, 2014, it was announced that Lendl and Murray would be ending their two-year coaching partnership.