This chapter reports the literature on the labor-supply decision of professional golfers and is able to replicate with new data three important results. It also reviews three studies on the participation decision of professional golfers and tests their conclusions, and two natural extensions, concentrating on the European tournaments of the European Tour. It is confirmed that professional golfers respond to incentives, and is revealed that professional golfers are more likely to play the events they played the previous year, particularly if they played well. Then, it is shown that non-elite players recognize the value of their tour card, by playing in more events when their playing privileges for the next year are at stake.