sweet spot 
noun informal
1The point or area on a bat, club, or racket at which it makes most effective contact with the ball: a bigger sweet spot forgives off-centre hits...
- He says the cold weather also helps because it makes him concentrate on hitting the ball on the sweet spot of the bat.
- The more often you hit the ball on the sweet spot of the club, the better your shots will be.
- Tennis-elbow-addled fans admired stars like Borg and McEnroe because they knew how tough it was to hit accurate, firm strokes with wooden rackets with tiny sweet spots.
1.1An optimum point or combination of factors or qualities: the market may have reached its sweet spot, with prices high enough to encourage sellers but still low enough to promise a good return...
- Auctioneer Richard Estes sees three sweet spots with appeal to different audiences.
- That puts Juniper, with its focus on telecoms, in the sweet spot for revenue growth.
- Growth has settled into the 2 % to 3 % range that many experts consider the country's sweet spot.
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