We have seen not nearly enough of Amir Khan, the lost superstar of British boxing. Just five fights since December 2012, unless you include the Twitter spat with his wife, happily resolved. Thus a career that might have been so much more, rolls into Saturday’s meeting with enthusiastic trier Phil Lo Greco at the Liverpool Arena in need of oxygen. Even Khan admits a fifth defeat would be terminal. This is his first engagement since the devastating loss to Saul ‘Canelo’ Alvarez 23 months ago in Las Vegas, an ill-fated leap into a middleweight division beyond his genetic coding. It made little difference that the fight was made at five pounds beneath the conventional 160 pound limit since a rehydrated Canelo would have walked in the ring at least a stone heavier than Khan, who would struggle to match his opponent’s weight with lead in his pockets. That Khan was ahead on one judge’s card should not surprise. The lad can box and has the heart the size of a cannon ball. You don’t make it through the Olympic qualifying process at 17, let alone come home with a silver medal without talent and ticker. You might argue he has too much of both, a problem when a vulnerability about the chin is exposed along the food chain, as it was so brutally by that Breidis Prescott anvil a decade ago.