I remember doing a clinic/exhibition with Johnny Petraglia and someone asked him about shooting spares....his response was not on technique but preparation. He said he generally has taken more time over his career shooting spares than his first ball. Most of today's bowlers are so rushed or fried they left something they take no time at all and end up missing the spare.
Also it has been noted that Sean's tempo tends to get faster on the show, which has been previlant in some of his first balls shots, being faster or going brooklyn from being pulled...this will translate into spare shooting as well.
It is amazing how many spare are missed, at the pro level than ever before. Go watch a tourney...it is truly amazing from the days when Mark Roth would go weeks, not blocks without an open frame...not just a missed spare but an open frame.
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