Dan Knowlton tamed what was a tricky wet-dry Mark Roth 42 lane pattern, averaging 237.25 to lead Monday’s first round of the 2021 PBA50 Spectrum Lanes Open, according to results posted here. Knowlton later posted this on Facebook:"Today is Day 2 in Wyoming MI at Spectrum Lanes. I am leading after 1 squad (I am just as shocked as all of you are!!). Used Hammer Obsession Tour for first 5 1/2 games then switch to Brunswick Knockout last 2 1/2 games. Had a great cross with Jeff Johnson and...