Arsenal romped to a 4-1 win at Portsmouth in the Premier League on Saturday to extend their winning streak and secure provisional top spot. Abou Diaby hit a brace on 18 and 21 minutes to give the Gunners a good advantage, before Younes Kaboul reduced the arrears eight minutes from the interval. William Gallas widened the gap early in the second period with a third for Arsenal, and substitute Aaron Ramsey added a fourth eight minutes past the hour mark to leave the hosts with a mountain to climb. Now the Gunners are at the top of the Premiership table on goal difference with six points. Earlier this month, Arsenal destroyed Everton 6-1 in their Premiership opener before recording a vital 2-0 win at Celtic in a UEFA Champions League playoff. The match's goals