Quick Hits: Walker, Rangers, Harrison, Blue Jays

Recent Mariners callup Taijuan Walker's skin color is important for the future of baseball, as just 2.3 percent of the 648 pitchers who have thrown in the majors this year are American-born black players, Jeff Passan of Yahoo Sports writes. The rise of Walker, whose father is black and mother is half-Mexican, half-white; and the Rays' Chris Archer, who was born to a black father and white mother, "represents what the league desperately hopes is a trend and not an anomaly," Passan says. On to more Saturday night major league links:

• Over the last two seasons, National League starters acquired by the Rangers have failed to succeed in the AL West, tweets Evan Grant of the Dallas Morning News, posting a collective 4.72 ERA, 1.38 WHIP, and 1.37 HR/9. Though Grant rightly acknowledges that the sample is far too small to be conclusive, it is certainly true that both of the team's major trade-deadline acquisitions – Ryan Dempster (2012) and Matt Garza (2013) — have put up pedestrian numbers for Texas.
• Rangers left-hander Matt Harrison will have surgery to repair thoracic outlet syndrome in his right shoulder on Monday, Grant reports. Harrison had the same procedure, in which a rib is removed, on his throwing shoulder in 2009. “Since I’m already shut down with the back issues for the year, I might as well get it taken care of,” Harrison commented. Rangers GM Jon Daniels says he believes Harrison will be ready for 2014 spring training, Anthony Andro of Fox Sports Southwest tweets.
• Blue Jays assistant GM Andrew Tinnish and scout Danny Evans were in Japan in August to scout Masahiro Tanaka, Bob Elliott of the Toronto Sun reports via Twitter. Clubs connected to Tanaka so far include the Twins, Giants and Yankees.

Jeff Todd contributed to this post.