AMES, Iowa (Ticker) -- Oklahoma State and Iowa State set a blistering pace that only the Cowboys could sustain.

Ivan McFarlin and John Lucas scored 21 points apiece as No. 13 Oklahoma State extended its winning streak to a season-high seven games with an 88-67 Big 12 Conference victory over Iowa State.

Tony Allen added 18 points for the Cowboys (17-2, 7-1 Big 12), who have not lost since opening conference play with an 82-63 defeat at Texas Tech on January 10.

"I think if we work hard, and keep playing the way we're playing, we can still win the league," Cowboys coach Eddie Sutton said. "I'm really proud of this team. All the players work hard and understand their roles."

Jake Sullivan scored 21 points for Iowa State (13-6, 4-4), which had its 12-game home winning streak snapped.

Iowa State jumped to a 12-4 lead after making its first five shots, including a pair of 3-pointers by Sullivan. But the Cowboys held the Cyclones scoreless over the next 4 1/2 minutes while scoring nine points.

OSU took the lead for good, 22-20, with 8:31 left in the first half on a jumper by Terrence Crawford.

"We wanted to come in today and make a statement," McFarlin said. "We knew we had to play hard and get up early. If we got up early, we'd have a good chance to win. We fought back to get the win today."

Iowa State stayed within striking distance in the first half, shooting 52 percent from the field while Oklahoma State shot a blistering 67 percent. But the Cowboys pulled away in the second half, outscoring the Cyclones, 49-37, after intermission.

"We just had to come out with high intensity, but they just kept their focus," said Iowa State freshman Curtis Stinson, who scored 19 points.

Oklahoma State nearly maintained its pace, finishing at 63 percent. More importantly, after failing to get to the free throw line in the first half, the Cowboys converted 13-of-17 foul shots.

The Cyclones have lost four in a row and 15 of 18 in the series.

"We didn't play as well defensively as we usually do," Stinson said. "They do a lot of high-percentage shots. They stayed focused and played together."