The Milwaukee Bucks head out on a challenging four-game western trip with the best record in the Eastern Conference of the National Basketball Association. But as their coach bemoans everything from soup to nuts, there is one important factor to keep in mind.

"My (complaining) has an optimism to it," said coach George Karl.

Those words will undoubtedly be comforting for the Milwaukee players who, by hook or crook, have managed to win nine of 10 games, yet will need to be fitted for saddles should the coach continue to ride them with such vigor.

What is on the coach's mind as he led the team west for a showdown with the Los Angeles Lakers at the Staples Center Tuesday night and later meetings with Phoenix, Portland and Seattle?