Who is Miomir Kecmanovic, the Serbian who challenged Sinner in Wimbledon first round?

Kecmanovic, making his seventh Wimbledon appearance, went toe-to-toe with the World number one throughout the duration off the match before he eventually ran out of gas in the fifth set and lost 6-4, 3-6, 7-6 (8), 6-2, 6-3.