"He may be the best player in the league," Riley said.
Riley's opinion was backed up Wednesday night, when Nash hit a 3-pointer with 2:20 left to stop a huge Miami run and help lift the Phoenix Suns to their 12th straight victory, 99-89.
The win turned out to be a struggle for Phoenix, which wasted most of a 25-point fourth-quarter lead.
"We took care of it," Nash said. "We lost all our momentum in the fourth quarter. That happens -- but we won the game."
Shawn Marion had 23 points and 13 rebounds, Nash had 18 points and 11 assists and Boris Diaw scored 13 points for the Suns, who have the second-longest winning streak in franchise history and finished a road trip 5-0 for the first time since April 1998.
"We should have opened the game and closed it," Marion said. "This is their home court. They're not an NBA team if they just sit down."
Phoenix led 88-63 with 9:52 left, before the Heat scored 17 straight points and went on to outscore the Suns 22-2 over a 6½ -minute stretch to draw within five. But Nash's shot from the top of the key ended that burst, and sent the Heat to their seventh loss in 11 home games this season.
"Nash makes the whole thing work," Riley said. "We got something going in the fourth quarter and made it exciting, and he makes the 3 to really break our back. ... That team is a very good team. They belong at the top."
The Heat's rally came primarily with only one starter, Jason Kapono, on the floor. Kapono had 11 points during the run, including a 3-pointer with 2:40 left that got Miami within 90-85. But Nash answered that one 20 seconds later with his 3, and the Suns would hang on from there.
"The league MVP," Heat forward James Posey said. "He had a big 3 there."
"You've got to give a good effort against them because it's like a track meet out there," Hite said. "We gave it a great effort at the end. A couple more shots go down, a couple more chances, and it's a different story."
The undermanned Heat were without their two biggest stars -- Wade had wisdom teeth removed Tuesday, and O'Neal missed his 17th game as he continues to recover from surgery to repair torn knee cartilage.
For most of the game, it looked like even they wouldn't be enough to help the Heat against an onslaught like Phoenix's.
The Suns connected on 10 shots from 3-point range and trailed only once -- 2-0 after Heat guard Jason Williams opened the game with two free throws.
"We played pretty well, had a good lead, thought the game was over and kind of shut it down," Suns coach Mike D'Antoni said. "You have to give them credit. They didn't quit. They played good and hard. That's a trademark of a Pat Riley team."
The Suns took a 16-point lead into halftime and stretched it to 84-63 entering the final quarter. Phoenix then had the first four points of the fourth, before the Heat began their comeback try.
"We weren't going to give up like that," Posey said. "We tried to give ourselves a chance. Just got in too deep of a hole."
- Phoenix's franchise record for consecutive wins is 14, set in December 1992.
- Miami F Antoine Walker, who was 0-for-3 in 10 first-half minutes, did not play in the second half.
- The Suns shot 53 percent in the first quarter, which is the worst they've shot in the opening 12 minutes during this 12-game winning streak.
- Wade was not flying with the Heat to Washington on Wednesday night and isn't expected to play when Miami visits the Wizards on Friday. He could play Saturday when Miami hosts Memphis.