A 40-point burst from star shooting guard Devin Booker went in vain as the Milwaukee Bucks defeated the Phoenix Suns 123-119 away from home to take a 3-2 lead in the NBA Finals series on Saturday.

Two-time NBA MVP Giannis Antetokounmpo lead the scoring for the Bucks with 32 points, nine rebounds and six assists and scored a slam dunk in the final seconds to clinch the contest. Khris Middleton scored 29 points and Jhrue Holiday added 27 as the Bucks moved to within one win of their first NBA title since 1971.

The game was neck-and-neck in the final minutes of the fourth quarter, when Holiday stole the ball from Booker and passed for Antetokounmpo to make a slam dunk, while Middleton scored a free throw the seal the win.

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"One game away. We can't get too high on the horse. We know the last game is the hardest to win. We know they will come out and play desperate. We've got to do the same thing," Holiday said in his post-match comments.

Game six of the series will be held on Tuesday in Milwaukee, which if the Bucks win, they will become only the fifth team in NBA Finals history to be champions after losing the first two games.

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If the Suns win, they will force a game seven at Phoenix on Thursday.

The Sun came bursting out in the first quarter, leading the Bucks 37-21 before the visitors rallied to establish a 14-point lead. However, the home side fought back to bring the score to 120-119 but were unable to resist the Bucks star steal the show.

"Big time steal by Holiday and great pass," Antetokounmpo said. "He trusted me, threw the ball up there. It was a great play by Holiday."