Australian Open: A battling Andy Murray bowed out of the Australian Open at the first hurdle Monday, but it was business as usual for ruthless Roger Federer and Rafael Nadal who joined Caroline Wozniacki in round two. The Scottish five-time Melbourne Park finalist gave it everything he had and showed glimpses of the form that won him three Grand Slams, but his ailing body let him down during a gutsy 6-4, 6-4, 6-7 (5/7), 6-7 (4/7) defeat to 22nd seed Roberto Bautista Agut. Murray tearfully revealed before the tournament that he was in constant agony from a hip injury and planned to retire this year. The 31-year-old hopes to end his career at Wimbledon, but has admitted the Australian Open could be his last event, unless he has a late change of heart. “Amazing. That was incredible, thank you so, so much to everyone that came out tonight,” he said after being given a rapturous send-off. While his tournament ended in despair, Swiss master Federer, six years older than Murray, continued his march towards a record seventh Australian Open title. He swept past Uzbek Denis Istomin 6-3, 6-4, 6-4 said he was in “disbelief” that he was the double defending…