South China forward Au Wai-lun admitted the hard part was still to come after his team maintained their 100 per cent record with a rout of Double Flowers at Mongkok Stadium yesterday. The Caroliners made it four league wins on the trot with their 4-1 success but Au was quick to point out: 'We haven't played against the strong teams.' After wins over Fukien, Rangers, Football Club and pointless Double Flowers, South China's next two matches are against Happy Valley coming Sunday and champions Sun Hei on November 9. Au, who netted his team's third goal, said they would be up to the challenge. 'Our spirit is high as we haven't lost any points yet,' he said. 'We're confident of beating Happy Valley and Sun Hei.' Au also called on his Hong Kong-born teammates to prove they can match up with the league's overseas players. The Caroliners have only one import, Brazilian defender Cristiano Cordeiro, while Happy Valley and Sun Hei have four each. 'We only have one foreign player but the local players have done well,' said Au. 'We might not be as strong in the air against the big expatriates of Happy Valley and Sun Hei, but it doesn't bother us much as we play the ball more on the ground.' South China team director Peter Leung Shou-chi was happy with yesterday's win and said: 'Our team played even better in defence than in attack. The coming two matches will be a big test of our defence before we play Shimzu S-Pulse.' South China will host J-League side Shimzu in the first leg of their AFC Champions League third-round clash at Hong Kong Stadium on November 12. Leung confirmed South China had been looking for a centre-forward but emphasised money had to be spent wisely after their budget was slashed from $12 million to $8 million this season. 'We've tried for a few but haven't signed anyone yet,' he said. 'Why should I sign someone when they are only a little smarter than our local players? The deal has to be really worth the money.' Double Flowers took the lead in the 12th minute yesterday when a long-range shot from teenage midfielder Lee Ying-wai found the net. But South China levelled the score minutes later when left-winger Chan Chi-hong headed home a Lee Kin-wo cross. Double Flowers' task became even harder shortly before the break when defender Gus Caesar was sent off for his second bookable offence after fouling Au. South China went ahead three minutes into the second half when forward Tam Wai-kwok volleyed home a Luk Koon-bong cross. Au's close-range header late in the second half killed off the opposition before an own goal from Double Flowers' Ng Wai-kwan rounded off the scoring. In yesterday's other match, Slovak forward Martin Jancula gave Happy Valley a 1-0 win over Fukien, heading home a Lo Kai-wah cross in the 10th minute.