This depends on a lot of things. One set requires a minimum of 24 points to be won by one player.
Some mathes are one set, some are best of 3 sets, some are best of 5 sets, some are best of 3 sets with the 3rd set being a match tie-break (first to 10 points but must win by 2 points. Eg. 10-8 or 13-11 or 24-22 etc.).
Most tennis matches are best of 3 sets. This means that the first player to get 2 sets wins the match. The player will need a minimum of 48 points.
I hope this answered your question. But there are too many things to depend on to win a match. One match can take over 1,000 points (even though it is very, very, very unlikely).
The player has to score 6 points to win
Winner - 2000 Finalist - 1200
The winner gets 25 points as of the 2009 season.
1,950 ranking points - 50 points less than for a grand slam - are an offer at the World Tour Finals, 1,500 of which are awarded to the winner.
10 points as a maximum
we need 4 points to win a game in lawn tennis
previously it is for 21point but now it is for 11 points
For the men the level of tournaments goes Grand Slams, 1000 Series, 500 Series, and 250 Series. Technically, the 250 series is the 3rd tier for tennis tournaments. These tournaments give 250 points to the winner.