Nationals pitcher Sean Doolittle announces his retirement after
Sean Doolittle - Wikipedia
A perfect Sean Doolittle has middle innings set for Washington
I just can't do it': Nationals pitcher Sean Doolittle declines
Nationals Doolittle Retires Baseball, National Sports
Watch Live: Washington Nationals pitcher Sean Doolittle announces
Washington Nationals News: Former closer Sean Doolittle signs in
Sean Doolittle Announces Retirement - MLB Trade Rumors
Nationals pitcher Sean Doolittle announces his retirement after
Sean Doolittle retires after path led to All-Star, World Series honors