Dane Bo Henriksen has been appointed coach of ailing Mainz in succession of Jan Siewert on a contract until 2026, the Bundesliga club said on Tuesday. Henriksen, 49, joins second bottom Mainz from Switzerland’s Zurich, where he was in charge since 2022 but would not renew his contract beyond the season. He previously coached Danish sides including Midtjylland. His first match will be on Saturday against Augsburg, with the official presentation set for later Tuesday. “We undertook an intense analysis of the tough situation we currently find ourselves in to determine which type of coach and whic…