ST. PETERSBURG, Fla. — Opening the season at Triple-A Iowa was not the ideal beginning to the year for right-hander Javier Assad. The 28-year-old has proven to be a reliable big-league pitcher over the last four years, posting a 3.43 ERA in 78 games (54) starts for the Chicago Cubs in that span. But the Cubs’ starting pitching depth and Assad still having a minor-league option meant going to ...