Okla. Stat. tit. 59, § 725.5

A health care provider authorized to use the designation “Doctor”, or an abbreviation thereof pursuant to the provisions of Section 725.2 of Title 59 of the Oklahoma Statutes, who renders medical care on a voluntary basis at a free medical clinic or an educational sporting event is not liable for any civil damages, other than for injuries resulting in death, caused by acts or omissions of the health care provider while rendering such medical care unless it is plainly alleged in the complaint and later proven that the acts or omissions of the health care provider constituted gross negligence or willful or wanton wrongs during the rendering of such medical care.