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Andy Murray won the European Open in October.
Andy Murray won his first match in over a year with a three-set win over Reilly Opelka.
The American had a set and a break lead, but the older man fought back to win.
After converting his first match point, Murray let out a roar.
If Dan Evans beats Aslan Karatsev in the other semi-final, it will set up the first all-British final on the tour.
Murray claimed an emotional victory over Wawrinka in the European Open.
Murray had career-saving hip surgery in January and has only won one singles trophy since.
It would be great to start the year with a trophy, but it has already been a big week for me," Murray said in his on-court interview.
I managed to string four results together last year.
The Australian Open starts on Monday and Murray will play Georgian 21st seed Nikoloz Basilashvili in the first round.
He has moved well in all of his matches in the past two years despite being ranked 135 in the world.
Murray was upset after letting a lead slip in the first set against the big-serving Opelka.
His return was excellent, as he broke Opelka early in the second set to force a decider.
Murray couldn't convert four break points on the Opelka serve before he eventually found a way through and served out the match to love.
It's not easy to come back against someone who serves like that, but I love competing.