Just now, Andy Murray announced a competition where in one (yes, one) lucky winner will get a racket signed by him. You too can participate in that contest right here.
Okay, let me quickly answer this question. Firstly, the question is not as simple as it looks to be.
(i) On 26.09.2005 (just before the start of Thailand Open, where Murray got a wild card), Murray was ranked #109th with 396 ranking points. On that very day, the #100th ranked player was Albert Costa with 410 points.
(ii) So, in simple words, what I intend to explain is that Murray needed about 14 points to break in to Top 100.
Thailand Open then was a part of ATP International Series
During those days, the following were the points that players used to get ATP International Series including Thailand Open
Round 64 losing player 1 point
Round 32 losing player 3 points
Round 16 losing player 5 points
Round 8 (QF) losing player 12 points
Round 4 (SF) losing player 22 points
Losing Finalist got 35 points
Winner got 50 points
So, according to me, after Andy Murray wn his QF match, he surely booked his place in the Top-100 for the first time.
& his opponent in the QF was Robby Ginepri.
So, my technical answer is Robby Ginepri :).
But, wikipedia page of Andy Murray suggests the answer is Paradorn Srichaphan :)..
What about you? Feel free to drop in a comment or tweet me..
For more such answers, see our Tennis site right here.