Yi left Sunday's 128-106 loss at Indiana early in the fourth quarter with a sprained left ankle and did not return. He is listed as day-to-day.

"It's hard to tell right now," coach Larry Krystkowiak said Sunday when asked about the severity of the injury. "It varies from person to person."

Yi, Milwaukee's first-round pick in the 2007 draft, is having a solid rookie season, averaging 8.9 points and 5.3 rebounds in 25.5 minutes per game. However, the Chinese forward has made just one start since Feb. 2 after starting his first 48 games and has scored a total of eight points in his last five games.

Yi had four points against the Pacers, while Michael Redd scored a team-high 28 for the Bucks, who have dropped four in a row four times this season. Redd leads Milwaukee (22-38) with 23.6 points per game and has averaged 30.6 over his last five.

Krystkowiak, however, was more concerned with his team's defense. The Bucks have allowed their opponents to score in triple figures in five of six games.

"We're not going to beat anybody, there's not a chance, if we give up 64 points in each half," Krystkowiak said. "Sometimes, our offense is good enough to keep us in games, but without a more concerted effort on our part to guard people, it's going to be real tough to get a win."

Redd scored 41 points in Milwaukee's last game against the SuperSonics (16-44), a 104-98 loss in Seattle on Dec. 7. Yi added 13 points and four rebounds, but Seattle rookie Kevin Durant matched his season-high with 35 points.

The loss was Milwaukee's third in four games in the series, but the Bucks have won four of five at home against the Sonics.

Durant, who leads NBA rookies with 19.4 points per game, had 20 in Tuesday's 100-97 loss in Detroit. Seattle, playing the second game on a seven-game road trip, fell to 6-23 away from home.

The Sonics have dropped four of five overall.

"This was a game that could have been won," coach P.J. Carlesimo said. "Even late, we had opportunities. Not taking anything away from them, this is an excellent team, but we could have done some things better. We could have controlled our own destiny better than we did."

The Sonics led 41-28 heading into the second quarter after their highest-scoring period of the season. However, they went 0-for-12 to start the second and shot just 32 percent from the field in the final three quarters.

"I'm very disappointed, because we fought hard in the first quarter against one of the best teams in the league," said Chris Wilcox, who had 20 points. "We stayed close with them through the whole game, but we couldn't pull it out at the end."