There's no guaranteed "ace button," but consistent aces come from **timing, placement, and Mii stats**. Here's how to maximize them:
| Serve | Motion | Best For |
|---|---|---|
| Flat (Power) | Toss high → Snap wrist forward at peak | Aces down the T or wide; high-risk |
| Topspin | Toss slightly forward → Brush up back of ball | Consistency, kicks up on opponent |
| Slice | Toss right (righty) → Cut across outside | Pulls opponent wide, low bounce |
| Underhand | Short toss → Scoop up gently | Surprise, short ball (rarely aces) |
In original Wii Sports, a **super-fast flick** at toss peak could trigger a 200+ mph serve (visual glitch). Removed in Resort/Club. Not reliable.
Bottom Line: Aces = **high toss + peak contact + corner aim + high Power Mii**. Practice 10 min daily → muscle memory → free points.