Step 1: First blank (i).
The subject is "athletics," which in this context is treated as singular. Therefore, we say:
\[
\text{Athletics \; holds \; the potential for a spectacle.}
\]
So, (i) = holds.
Step 2: Second blank (ii).
The subject is "The crowd." In formal grammar, "crowd" is generally singular. Hence:
\[
\text{The crowd \; waits \; with bated breath.}
\]
So, (ii) = waits.
Step 3: Third blank (iii).
The subject is "Six cross-steps," which is plural. The verb must match the plural subject:
\[
\text{Six cross-steps \; culminate \; in an abrupt stop.}
\]
So, (iii) = culminate.
Step 4: Fourth blank (iv).
The subject is "his body," which is singular. Therefore:
\[
\text{As his body \; pivots \; like a door turning on a hinge.}
\]
So, (iv) = pivots.
Thus, the correct sequence is:
\[
\boxed{\text{(i) holds, (ii) waits, (iii) culminate, (iv) pivots}}
\]