England fast bowler Jofra Archer has the "X-factor" that unsettles opposition batting lineups, said former Australia captain Steve Waugh who believes the evenly-balanced Ashes series would be decided by a few key moments. Archer made his test debut in the drawn second match at Lord's and produced several spells of menacing quick bowling, hurrying the Australian batsmen up and forcing them into evasive action from deliveries that averaged more than 145kph.