Here is your ggf's ML pitching line from Baseball-Reference.com. He appeared in four games, starting one and in relief in the others.
I was able to find box scores in the New York Times for the four games he played. They are not pitch-by-pitch or batter-by-batter accounts by any stretch but you can still infer a lot. He didn't get the chance to "sit down" Cobb but he faced the likes of Tris Speaker and Home Run Baker and that is sure something. He had some solid outings. Why he didn't stick is a mystery for someone else to solve.
His first appearance was on July 30, 1909, pitching two innings in relief of Carl Sitton against the A's in Philadelphia. The NY Times mis-spelled his name in the box score.
He made his only major league start, a 6-2 defeat, on August 4 against the Senators in the second game of a doubleheader in Washington. Walter Johnson had outdueled Addie Joss 1-0 in the first game. Looks like Senator base runners had a field day with the battery of Great-Grand Dad and Nig Clarke.
Next appearance was August 12 against the Red Sox in Boston where your ggf came in relief of the mighty Cy Young and pitched four scoreless innings.
His final ML appearance was a home game against the A's eight days later on August 20. Looks like he inherited a couple of runners from Sitton in the first and didn't get out of the inning that easy but otherwise pitched solidly the rest of the way. Cleveland being held scoreless didn't help the cause. He had his only big league hit that day, a single off Jack Coombs.
