23 January 2012 Last updated at 13:07

Lendl reveals Murray partnership is progressing well

Andy Murray's coach Ivan Lendl tells 5 live's Jonathan Overend that the pair are having "good times" and "everybody is making jokes" as they work through their first major tournament as a partnership at the Australian Open, where Murray has reached the quarter-finals for a third successive year .

Eight-time Grand Slam winner Lendl believes Murray is "hitting the ball and moving well" and is "underestimated" as a server, adding he is pleased with the amount of points the Scotsman is winning on his second serve.