Why didn't any of the top 10 players showed up in Memphis?

question.

if take @ atp world tour calendar ....
http://www.atpworldtour.com/tournaments/...

... see week starting 18 february 2013 has not one, not two, 3 *tour-level* events going on @ same time: memphis [usa], marseille [france], , buenos aires, argentina. not unusual.

top ten guys [djokovic, federer, murray, ferrer, nadal, berdych, del potro, tsonga, tipsarevic, , gasquet] ...

... of them grew on clay or predominantly clay. 1 might not have had clay time @ home might murray, trained in spain lot when junior, if memory serves me correctly. had plenty of clay growing up, too.

ok, so, if had choose tournament on surface like, surface you're comfortable with, opposed surface don't much, *also* more produce injury, surface choose? answer clay, or maybe grass, that's summer, , small part of calendar.

and, written a couple of responders, it's atp-500 event, *optional* top-30 players, or commitment players. while have play 4 of atp-500 events, not have play of them.

otoh, commitment players obligated show @ masters 1000 events; that's part of atp rule book:
http://www.atpworldtour.com/corporate/ru...

"d. commitment
commitment commitment player is, singles event of atp world tour masters 1000 tournaments accepted, barclays atp world tour finals (if qualified direct acceptance or designated alternate) , 4 (4) atp world tour 500 tournaments, 1 (1) of must held following open. commitment , ranking purposes, monte carlo masters 1000 included in minimum requirements 500 category. 2013 davis cup points may counted 1 (1) of best of 6 (6) in emirates atp rankings, how- ever, shall not count towards commitment requirement of commitment player. see page 184 “ranking penalty.”"

it's 500 event nobody there

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