To be honest it depends on the serves of the 4.5 guys. My lefty first serve can easily hit 110mph and I have timed it as well on radar. If I can land one of those and my other 4.5 partner is at the net waiting to put away the return shot, then I think we can get a decent enough score on the tie-break.
3x Prokennex Ionic Ki 5 , strung w/Wilson NXT 16 @ 60lbs
NTRP 4.5 lefty