[Centripetal Charge] and [Charged Plating] have great synergy to get you to 20% Ability Power in round 1, along with [Power Playbook]. Use your ult at the earliest opportunity to secure the buffs from [Charged Plating]. If you play it well, you can often get ult in the first fight.

Try to focus on landing javelins on squishies to secure eliminations and proc [Frenzy Amplifier], which will either allow you to keep rolling the squishy eliminations or run away from the enemy tank if you're low on resources. If you're playing into beams, use your superior range to your advantage and your speed to out-rotate the enemy tank. You should be able to farm loads of Stadium Cash in round 1, even into Zarya.