Spurs can lose a series to any of the other elite teams in the West(GS, LAC, OKC, Hou), but I don't think any of them are particularly bad matchups like the Thunder and Rockets used to be IMO..
Clippers- went to 7 games and a buzzer beater to beat a Spurs team where everybody save 3 players played below expectations..they could still beat the Spurs, but it's not a bad matchup, and having Aldridge instead of Splitter on 1 calf should help blow up their primary play that they ran repeatedly, all series(to great success)
Thunder- Ibaka is the biggest matchup problem against them, and having Aldridge's jump shot should take Ibaka out of the paint..still a dangerous team, but not really a "matchup problem" anymore IMO..also helps that Reggie Jackson is gone, somehow always killed the Spurs
Rockets- I'd probably have them at #1 here, Harden is the only player in the league that hasn't been solved by the Kawhi/Green duo, but Aldridge absolutely owns and destroys them, which should help
Warriors- as strange as it is to say, considering they're the defending champs(and I'm not one of the fans that downplays their le, they had a historically good year, tbh), they are probably the easiest matchup of all these teams for the Spurs..for whatever reason, Spurs seem to match up well with them..