Just you should PM to me, because don't know when to open the thread for Davis Cup and I should use 10 matches, right. 2 Semifinals + 8 World group playoffs
Yes 10 matches should be used.
Although there will be big time differences with matches being played in Australia and Japan - and Chile
It will probably be fine if you open the thread at some time at the start of the 2nd week of the US Open.