Roy Halladay
... that the 20 days between Dallas Braden's perfect game and Roy Halladay's was the shortest span between two perfect games since 1880?
... that the 20 days between <a href="./Dallas_Braden's_perfect_game" id="mwC6M" rel="mw:WikiLink" title="Dallas Braden's perfect game">Dallas Braden's perfect game</a> and <b id="mwC6Q"><a href="./Roy_Halladay's_perfect_game" id="mwC6U" rel="mw:WikiLink" title="Roy Halladay's perfect game">Roy Halladay</a></b><span about="#mwt46" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"`s","href":"./Template:`s"},"params":{},"i":0}}]}' id="mwC6Y" typeof="mw:Transclusion"><span typeof="mw:Entity">'</span>s</span> was the shortest span between two <a class="mw-disambig" href="./Perfect_game" id="mwC6c" rel="mw:WikiLink" title="Perfect game">perfect games</a> since 1880?