With six minutes left in the first quarter of his Boston Celtics debut, Gordon Hayward's season took a turn for the worst as he suffered a gruesome leg injury that will likely see him sidelined for the rest of the year.During the Celtics' season opener against the Cleveland Cavaliers, Hayward, who signed a four-year, $128 million maximum contract with the team during the summer, sustained a horrific leg injury that was visually hard to look at.After receiving treatment on the court, the small forward left the court on a stretcher with a protective sleeve around his leg. After further evaluation, it was revealed he had dislocated his ankle and fractured his tibia.It's such a nasty injury for any player to get, and it has come at an unfortunate time for Hayward as he looked to be an emerging star in the NBA after he averaged 21.9 points, 5.4 rebounds and 3.5 assists per game last season for the Utah Jazz.You don't even have to see the injury itself to know the severity of it, as just by watching the Cavaliers bench, who had a front seat view of the injury taking place, you know it's one that could potentially see him miss the rest of the season.The Cavs bench got up and looked away as soon as the injury happened to Hayward as you can see in the video below. Some even had to move away from the bench area on the sidelines as the injury was too horrific.

The Cavaliers went on to win the game and beat the Celtics 102-99.

Hayward will likely need surgery for his injury, which will probably mean he will be out for the rest of the season, though an official timetable for return has yet to be confirmed. One doctor does believe that not only will Hayward return this season, but he will be back in four to five months.

It's just a brutal injury to see happen for any player in any sport at any point in their career. We wish Hayward a speedy recovery and hope he is back and playing on the court for the Celtics very soon.