The powerful right-hander's dual ability with bat and ball has made him an integral part of the limited overs team for many years and he averages over 50 in World Cup cricket.
But he was dropped for Wednesday's game at the WACA to make way for fellow all-rounder James Faulkner, who was returning from injury.
"I believe in myself and my own abilities. If an opportunity comes along, I'll be ready to go," Watson said.
"I know I haven't scored enough runs, so I've only got myself to blame. That's the way it goes."
Watson's individual Australian record of 185 not out also looked set to fall, until Warner holed out for 178.
Australia captain Michael Clarke said Watson had not shown any disappointment during the match, even though Faulkner made just seven in the team's World Cup record total of 417.
"I thought 'Watto' handled it really well," said. "It's obviously a tough decision for the selectors. He was fantastic around the group all day."
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