Andy Murray's second serve: slower than Serena Williams', and a problem

By Jake Niall
Updated March 4 2015 - 10:08am, first published February 2 2015 - 10:55am
Missile gap: Andy Murray. Photo: Joe Armao
Missile gap: Andy Murray. Photo: Joe Armao
Missile gap: Andy Murray. Photo: Joe Armao
Missile gap: Andy Murray. Photo: Joe Armao
Missile gap: Andy Murray. Photo: Joe Armao
Missile gap: Andy Murray. Photo: Joe Armao
Missile gap: Andy Murray. Photo: Joe Armao
Missile gap: Andy Murray. Photo: Joe Armao