A quick check of the Google News archives reveals several possible baseball headlines that use the phrase "On Chapman's Homer." You can click on the one from the Milwaukee paper to see an actual scan of the page.
http://www.google.com/search?hl=en&q=%22chapman's+homer%22&sa=N&tbs=nws:1,ar:1#sclient=psy&hl=en&safe=off&tbs=nws:1%2Car%3A1&q=%22on+chapman's+homer%22&aq=f&aqi=&aql=&oq=%22on+chapman's+homer%22&pbx=1&fp=ccaa51474d1eb5cc
Matt Roth