Kevin Parrom, of Arizona, holds up his hands to signal his hitting three three-pointers in a row during a game against Washington State at McKale Center. Wildcats won 73-56. Saturday February 23, 2013 Tucson, Arizona

Mamta Popat / Arizona Daily Star

Kevin Parrom had a season-high 19 points while hitting 5 of 6 three pointers to lead the Arizona Wildcats to a 73-56 win over Washington State today at McKale Center.

The Wildcats built a 35-19 haltime lead and were ahead by as many as 22 points in the second half but let up on WSU defensively while also struggling at times against the Cougars’ zone defense in the second half.

WSU shot 52.2 percent from the field in the second half and cut UA’s leads to as little as 11 points.

The win moved UA to 23-4 overall and 11-4 in the Pac-12, where it remained in a first-place tie in the loss column with Oregon, pending the Ducks’ game with Stanford tonight.

WSU dropped to 11-7 and 2-13, having lost six straight games to the Wildcats.

Parrom started off the game for the Wildcats by hitting two three pointers in the first two minutes and wound up tying his career-high of five three-pointers, set first against Long Beach State earlier this season

The Wildcats built a 22-point lead with 16:47 left when Mark Lyons made a layup but Washington State went on a 10-0 run over the next four minutes causing trouble with a zone defense and getting a three-pointer from reserve guard Brett Boese that cut it to 43-31.

WSU twice cut UA’s lead to 11 points but Parrom answered the last one with one of his three pointers and the Cougars never came any closer.

In the first half, the Wildcats went deep into their bench early and often, while stifling Washington State’s offense and taking a 35-19 halftime lead.

Five players had two or more field goals each for UA, which shot 54.2 percent from the field while holding the Cougars to just 35.3.

Kaleb Tarczewski led UA with eight points and three rebounds.

WSU, which finished the half with seven turnovers, went without a field goal for 10 straight minutes in the first half, from Brock Motum’s three pointer with 18:20 left to D.J. Shelton’s inside bucket with 8:20 left.

At that point, the Cougars had just taken nine field goals and turned the ball over six times.

UA coach Sean Miller played all 10 of his active scholarship players in the first seven minutes of the game. Jordin Mayes was the first guard off the bench after Gabe York slipped ahead of him in the rotation on Wednesday against Washington.

In the first two minutes, Parrom hit two three-pointers in a game for the first time since Jan. 31 at Washington, and the Wildcats led 9-6 at the first media timeout.