The Boston Celtics triumphed 113-98 against the Cleveland Cavaliers to reach their third consecutive Eastern Conference Finals.
Jayson Tatum scored 25 points for the Celtics, who won the best-of-seven semifinal series 4-1.
They will face the Indiana Pacers or New York Knicks for the Eastern Conference title and a spot in the NBA Finals.
Elsewhere, Luka Doncic scored 31 points to help the Dallas Mavericks take a 3-2 series lead over the Oklahoma City Thunder.
The Slovenian guard had his second consecutive triple-double with 10 rebounds and 11 assists as Dallas recovered from a 14-point lead lost in game four.
“It’s just our mentality,” Doncic said.
“We know that in the last game we played them at home, we let them through. It was our mistakes and they made the shots.”
The Mavericks will have the chance to wrap up their play-off series and reach the Western Conference finals when they return home for game six on Sunday (01:00 BST).
Shai Gilgeous-Alexander scored 30 points for the Thunder, who now need to win consecutive games to advance.
Meanwhile, the Celtics could find out their Eastern Conference Finals opponent as early as Saturday when New York, which holds a 3-2 series lead against Indiana, travels to Indianapolis for Game Six.
Speaking after his team’s victory, Boston’s Jaylen Brown said: “It’s a blessing, honestly, to be a part of the win.
“It’s been a great journey so far, but we’re not done yet. We just have to keep going.”
