Murray had an excellent 2015 season, winning four singles titles and reaching at least the semifinals in three of the year's four major tournaments. It was a much-needed return to form for the 28-year-old after back and shoulder problems hindered him late in the 2014 season.
2016 turned out to be even better for Murray. He clinched the No. 1 spot in the ATP world rankings after reaching the finals at the Australian Open and French Open and winning Wimbledon. Murray also grabbed a gold medal at the Rio Olympics.
This season, he reached just the fourth round of the Australian Open, where he was upset by Mischa Zverev.
Unfortunately for Murray, the injury bug is back to throw a wrench into the entire process. He's proved his ability to handle adversity in the past, so hopefully this is just a small setback in what will be an otherwise successful year.