General Strategy:
This is a tough matchup for ol' Saks. Sagat's high health & damage put Saks in a bad position here. Always capitalize on whiffed moves, and make sure you keep a solid defense.
If your dealing with a "zoning" Sagat, you'll find yourself in an extremely uphill battle. Sakura has no tools for closing the gap here, so you need to look for certain openings. A Lp/Lk. Tiger Shot is your best bet on getting in, you'll have time to dash in before FAing or jumping these, giving you a decent position. Once you can get in mid range or closer, you'll be in a better position. Most "zoning" Sagats have very poor in-fighting abilities, and often mash Hp.Tiger Uppercut and Hk.Tiger Knees. Your job is to bait and punish these. DO NOT let him cross you over once you have him backed into a corner.
If your fighting a rushdown Sagat, you'll have less trouble getting hits in. The problem here is getting in enough hits to win the match. Sagat is a powerhouse, it will take many strong combos to bring him down. With these types you'll hafta watch out for his kara attacks, a good in-fighting Sagat can zone you better than their fireball happy counterparts. Mainly here you need to be patient and hold your defense waiting for mistakes. It only take Sagat a few specials to drop you. Also watch for Tiger Knee traps, Sakura has very little to answer these.