Fenway Sports Group have a knack for sealing bargain deals and their latest investment could set Liverpool up for long-term success. FSG’s cautious approach to investment has at times frustrated Liverpool fans, with the Boston-based group not prepared to bankroll huge losses like the owners of Man City, Chelsea or Newcastle. But in an era where Profit and Sustainability Rules are increasingly anchoring the football ambitions of US private equity groups and sovereign wealth funds, FSG‘s approach now appears sensible. Their commercial income is now around £270m per season, while upgrades at Anfi…