Stephen Strasburg thinks relying too much on his new slider put stress on his pitching arm and contributed to the injury problems that sidelined him during the second half of last season and the playoffs. ''I fell in love with it,'' the Washington Nationals right-hander said Sunday at the team's annual fan festival, ''because it was working, especially the first half. Strasburg threw sliders on 17.1 percent of his pitches last season, according to Fangraphs, more than changeups (13.1 percent) or curveballs (12.6). More...