Left-handed Pant propelled India to 349 for 6 with a pulsating 111 off 96 balls with other contributions coming from Anmolpreet Singh (41), Sarfaraz Khan (76) and Armaan Jaffer (64).
Anmolpreet also chipped in with three valuable wickets and alongside other spinners, Mayank Dagar (3/25) and Washington Sundar (2/27), plotted the downfall of Namibia, who folded up for 149 in 39 overs.
The African side was expected to show more fight in the quarterfinals after it famously knocked out defending champions South Africa in the group stage.
As it turned out, it was India all the way, be it the professional effort with the ball or their stellar batting performance after winning the toss.
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Pant's fireworks were on display hours before was bought by Delhi Daredevils for Rs 1.9 crore after a bidding war with the Mumbai Indians.
Pant, who had smashed 78 off 24 balls in the last match, was unstoppable today as well. The Delhi-based wicketkeeper batsman hammered 14 fours and couple of sixes in his entertaining knock that laid the foundation for a big total.
Sarfaraz too continued with his rich vein of form with a run-ball 76. It was his third 70 plus score in the four games India have played in the tournament.