Book excerpt: LOOK WHO'S PLAYING FIRST BASE Will Mike stand up to his teammates to defend his friend? When the Checkmates need a new first baseman, Mike Hagin's new friend, Yuri, seems like a logical choice. But when Yuri starts flubbing plays and the team's star player threatens to quit as a result, Mike is not sure Yuri is such a good choice after all-for a teammate or for a friend. It appears as if Mike will have to choose between his friendship with Yuri and his loyalty to the team-or is there another solution?