The Phoenix Suns have been on the prowl for a point guard all summer. Could they find one with the Boston Celtics?

The Suns have tried to deal for Celtics point guard Terry Rozier, "but to no avail," according to John Gambadoro of Arizona Sports 98.7 in Phoenix. Rozier is set to be a restricted free agent after this season. Boston has until Oct. 15 to negotiate an extension with him.

Phoenix had the NBA's worst record last season but has assets for a trade. It holds all of its own first-round picks and has the Milwaukee Bucks' first-rounder in 2019, a pick that could become particularly valuable given the protections on it. It would convey in 2019 only if it falls between the fourth and 16th picks. If the Bucks keep the pick in 2019, it becomes top-seven protected in 2020 and unprotected in 2021. Phoenix has young talent to deal, too.

The Suns could have targeted point guards in free agency this summer, but signed "3-and-D" wing Trevor Ariza to a one-year, $15 million deal. The contract absorbed most of their cap room. They haven't found a capable starting point guard to put next to the recently extended Devin Booker yet. The team, meanwhile, just traded guard Brandon Knight and big man Marquese Chriss to the Houston Rockets for power forward Ryan Anderson and 2018 second-round pick De'Anthony Melton.

Boston is in danger of paying a massive luxury tax bill for 2019-20, considering the money it could have to hand out next summer, when five-time All-Stars Kyrie Irving and Al Horford can become free agents alongside Rozier. The Celtics are currently about $3 million over the luxury tax line. Getting below it this season would help them avoid the repeater tax for an extra season.

Rozier started every game of the Celtics' run to the 2018 Eastern Conference Finals, filling in for Irving, whose season ended with a March knee injury. He averaged 16.5 points, 5.7 assists and 5.3 rebounds during the playoff run, solidifying a reputation as one of the NBA's best backup point guards. He started 16 of his 80 games played during the regular season.

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Fred Katz covers the Celtics for MassLive.com. Follow him on Twitter: @FredKatz.