[USER (data scientist)]: How do I create an empty table to store the head-to-head win-loss records? Please generate and display a DataFrame representing a head-to-head matrix initialized with zeros for the top 10 ranked players in the ATP tennis dataset.
My template of code snippet is:

---BEGIN CODE TEMPLATE---

import pandas as pd
import numpy as np
import pickle
from decision_company import read_csv_file,

# please import the necessary private functions from decision_company first

atp_tennis = read_csv_file('atp_tennis.csv')

# YOUR SOLUTION BEGIN:
<code1>
[COMPLETE YOUR CODE] 
</code1>
# YOUR SOLUTION END

print(head_to_head_matrix)

# save data
pickle.dump(head_to_head_matrix,open("./pred_result/head_to_head_matrix.pkl","wb"))

---END CODE TEMPLATE---

[YOU (AI assistant)]: No problem! Here's a simple way to create an empty table for the head-to-head records:
'''
import pandas as pd
import numpy as np
import pickle
from decision_company import read_csv_file,

# please import the necessary private functions from decision_company first

atp_tennis = read_csv_file('atp_tennis.csv')

# YOUR SOLUTION BEGIN:
