One of the big questions surrounding Yu Darvish prior to his much anticipated foray into major league baseball was whether he had the endurance to handle pitching every fifth day, throwing 100 stressful pitches per night, for 33 starts. The question is still unanswered. In Japan, the 25-year-old right-hander was a superstar/rock star. Between 2006 and 2011, he started 23 to 28 games a season and pitched between 182 and 232 innings. Most of the time he had six or seven scheduled days between starts. This year, the highly sought after Darvish, for whom the Rangers paid about $108 million (U.S.) for six seasons, has already logged 22 starts and 140.1 innings. If healthy, Darvish could possibly make 10 more regular season starts, including Friday vs. the Jays. Darvish has not disappointed fans, but he is showing signs of wearing down. In fact, his season results reflect the performance of the team itself. Consider that through June 30, Texas was dominating the AL standings with a record of 50-29, winning 16 of 19 games between June 9-30. Through June 30, Darvish was 10-4 with a 3.57 ERA and performing like rookie-of-the-year material. From July 1 to Aug. 16, the Rangers have gone 18-20, including Thursday's 10-6 win over the Yankees in the Bronx. Same time frame, since July 1, Darvish is 2-4, with a 6.60 ERA in seven starts, walking 29 and striking out 56 in 45 innings.