South Africa skipper Temba Bavuma admitted on Thursday that he was so stunned by seeing Pakistan described as "mercurial" that he had to "Google the word" out of respect for his opponents ahead of their World Cup clash. READ | 5 talking points | SA v Bangladesh: Proteas masters of batting first Pakistan, the 1992 champions, have hit a roadblock at the World Cup with their opening two wins followed by three one-sided defeats to arch-rivals India, Australia and then to neighbours Afghanistan.South Africa, on the other hand, have shaken off a shock loss to the Netherlands and have four wins to put them in sight of the semi-finals.Bavuma, however, is wary of the challenge posed by Pakistan, who can be frustratingly mediocre one day but devastatingly brilliant the next."I saw a comment that described Pakistan as mercurial," said Bavuma on the eve of the game on Thursday. "I had to Google the word, but it spoke about how a team can be good one day and not so good the next. "So, we want to make sure that when they're good, we are so good as well."Pakistan have won six of the last 10 meetings with South Africa, including by 49 runs when they met at Lord's in the 2019 World Cup.Current Pakistan skipper Babar Azam made 69 that day in a total of 308 before they limited the Proteas to 259 in their 50 overs.Six of the South African team who played in that match are likely to start on Friday. "We went through the Pakistan team, the threats that they bring, their strengths and obviously their weaknesses," said Bavuma, who has recovered from a gastric problem that forced him to miss the last two matches."We know that they haven't played close to their best, but tomorrow could be that.