Why don't you ask Tiger Woods?
They certainly experience flow, being in the zone.
But how does that relate to samadhi and jhana?
Ask yourself, does sports activity clearly relate to the typical presentation of the 1st jhana as "rapture & pleasure born from withdrawal". I don't think so. How is sports activity withdraw? See the quotes bellow, if you are not having happiness/pleasure/bliss/joy (sukkha) that rules out the first 3jhana. But, there is certainly something going on with flavors of absorption, altered sense of consciousness, concentration.
Take some passages from Csikszentmihalyi, Finding Flow:
1)"Flow tends to occur when a person faces a clear set of goals that require appropriate responses"
2)"challenges and skills are in balance, attention becomes ordered and fully invested. ... There is no space in consciousness for distracting thoughts, irrelevant feelings. Self-consciousness disappears, yet one feels stronger ... sense of time is distorted"
3)"in flow, we are not happy, because to experience happiness we must focus on our inner states, and that would take away attention from the task at hand"
I agree that flow is pointing to a state of mind known as the "action of inaction" or "doing without doing". But what is that state of mind in Buddhism? (assuming there is a parallel)