Zak Chelli is enjoying a much-deserved vacation. The unheralded former British and Commonwealth champion shocked the boxing world with his stunning upset over two-division world champion David Morrell (12-2 with 9 knockouts). With the win, Chelli improved to 17-3-1 (with 9 knockouts) and is now ranked No. 10 by The Ring in the light heavyweight division. KO on SI found odds as deep as 33-1 for Chelli to win by KO ahead of the fight. Other boxing news outlets have reported some odds were as high as 35-1 for Chelli to win. Odds were, of course, even higher for a 10th-round stoppage victory, which is exactly what Chelli earned over Morrell. Morrell had never been previously stopped. David Morrell | IMAGO / ZUMA Press Wire Chelli spoke to KO on SI from his vacation in Tunisia, where his father, Zakaria, is from, and where he is enjoying a long vacation after his long-shot victory. A career-altering victory that has put him in the driver’s seat of his career.…