That’s the key to success, isn’t it? It has to be fun.

Seles frames “success” not as a grim, purely results-driven pursuit but as something sustained by intrinsic enjoyment. In elite sport—where repetition, pressure, and public scrutiny can make performance feel like obligation—her remark suggests that long-term excellence depends on preserving playfulness and personal satisfaction. “It has to be fun” implies that motivation rooted in joy is more durable than motivation rooted only in fear of failure or external rewards. The line also reads as a quiet corrective to narratives that glorify suffering: discipline matters, but if the activity ceases to be enjoyable, the psychological fuel that supports resilience, learning, and peak performance can evaporate.