Trevor Bayne has been released from the Mayo Clinic in Rochester, Minn., after being admitted last week for testing and evaluation. The 20-year-old Daytona 500 winner will continue to be monitored closely by the Mayo Clinic team. Although he is expected to return to his NASCAR racing duties with both Roush Fenway Racing in the Nationwide Series and the Wood Brothers in the Sprint Cup Series this season, he will not be in Roush Fenway's No. 16 Nationwide entry this weekend at Darlington. The Wood Brothers' No. 21 Cup car is not entered at Darlington.

A time frame for Bayne's return has not been set at this point.

"Trevor Bayne was seen by a team of Mayo Clinic specialists where he underwent a series of tests and consultations over the last week," said Mayo Clinic neurologist Dr. Brian Crum. "He was admitted after suffering from nausea, fatigue and vision impairment. Since his admission, the nausea and fatigue have abated, and the vision impairment continues to be treated with medication, and is showing significant improvement.

"This symptom appears to be the result of an inflammatory condition. Further assessments will be made over the next couple of weeks. His condition is not life-threatening or career-ending. We expect he will continue to improve, although the time frame for his return to racing is unknown at this point. He will continue to be followed closely by his Mayo Clinic team."

Bayne was hospitalized for symptoms that were thought to be related to the insect bite he sustained in April. At the time, was treated and released from a North Carolina hospital after a reaction from the apparent insect bite on his left elbow.

Chris Buescher, who drove Roush Fenway's No. 16 Nationwide car last week at Richmond, will again fill in for Bayne this weekend at Darlington. Team officials are hopeful for Bayne's return at Dover the following week.