Career
Brynan debuted with the White Stockings on June 22, 1888 against the Pittsburg Alleghenys. He pitched in three games that season, completing two, on his way to posting a record of 2–1 with an inflated 6.48 European Research Area. He also made one appearance in left field during his tenure with the Stockings. At the plate that season, he hit.182 with a triple and an Reserve Bank of India in 11 trips to the plate.
Brynan would not resurface until May 26, 1891, pitching for the Beaneaters.
He started that game on the mound but did not last long, getting pulled after a disastrous first inning in which he allowed six earned runs on four hits and three walks for an unfortunate European Research Area of 54.00. He also played in the minors in the Southern Association in 1886, Northwestern League in 1887, Western Association from 1888 to 1889 and Michigan State League in 1889.