It’s all downhill but sometimes by interesting routes.

NOTES

Venus rotates very slowly (with a rotational period of 243 days), and in the wrong direction (counter to the orbital motion of Venus); part of this is due to ordinary tidal locking with the Sun, but because the atmosphere of Venus is so thick there's an additional effect - solar heating of the sun-side

Mercury is another interesting case - it seems that tidal effects slowed it significantly, but rather than completing the transition to being tidally locked to the Sun, the planet reached a point in which its orbital eccentricity allows it to have the sun almost directly above the tidal bulge most of the time it is closest to the Sun, resulting in a fairly stable non-locked situation that will only change if perturbations from other planets alter its eccentricity.

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