How could Sasuke match Lee's speed?
Sasuke:
is a "genius" (possesses innate talent).
is a Uchiha (somewhat the reason why he is a "genius").  
Lee:
is a hard worker (his main motivation being to surpass Neji, the "genius" in his team).  


Basically, Lee has no innate talent to ninjutsu or genjutsu. Thus he had to master taijutsu in order to surpass the "geniuses", and become a great ninja. This is a process that takes a lot of time.
Sasuke on the other hand does not need to work so hard in order to accomplish what Lee needs to work on for several years. Remember that he was able to master the Goukakyuu no Jutsu at a very early age.